@ohos.request (Upload and Download)

The request module provides applications with basic upload, download, and background transmission agent capabilities.

NOTE

The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.

Modules to Import

import request from '@ohos.request';

Constants

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Network Types

You can set networkType in DownloadConfig to specify the network type for the download service.

Name	Type	Value	Description
NETWORK_MOBILE	number	0x00000001	Whether download is allowed on a mobile network.
NETWORK_WIFI	number	0x00010000	Whether download is allowed on a WLAN.

Download Error Codes

The table below lists the values of err in the callback of on(‘fail’)⁷⁺ and the values of failedReason returned by getTaskInfo⁹⁺.

Name	Type	Value	Description
ERROR_CANNOT_RESUME7+	number	0	Failure to resume the download due to network errors.
ERROR_DEVICE_NOT_FOUND7+	number	1	Failure to find a storage device such as a memory card.
ERROR_FILE_ALREADY_EXISTS7+	number	2	Failure to download the file because it already exists.
ERROR_FILE_ERROR7+	number	3	File operation failure.
ERROR_HTTP_DATA_ERROR7+	number	4	HTTP transmission failure.
ERROR_INSUFFICIENT_SPACE7+	number	5	Insufficient storage space.
ERROR_TOO_MANY_REDIRECTS7+	number	6	Error caused by too many network redirections.
ERROR_UNHANDLED_HTTP_CODE7+	number	7	Unidentified HTTP code.
ERROR_UNKNOWN7+	number	8	Unknown error.
ERROR_OFFLINE9+	number	9	No network connection.
ERROR_UNSUPPORTED_NETWORK_TYPE9+	number	10	Network type mismatch.

Causes of Download Pause

The table below lists the values of pausedReason returned by getTaskInfo⁹⁺.

Name	Type	Value	Description
PAUSED_QUEUED_FOR_WIFI7+	number	0	Download paused and queuing for a WLAN connection, because the file size exceeds the maximum value allowed by a mobile network session.
PAUSED_WAITING_FOR_NETWORK7+	number	1	Download paused due to a network connection problem, for example, network disconnection.
PAUSED_WAITING_TO_RETRY7+	number	2	Download paused and then retried.
PAUSED_BY_USER9+	number	3	The user paused the session.
PAUSED_UNKNOWN7+	number	4	Download paused due to unknown reasons.

Download Task Status Codes

The table below lists the values of status returned by getTaskInfo⁹⁺.

Name	Type	Value	Description
SESSION_SUCCESSFUL7+	number	0	Successful download.
SESSION_RUNNING7+	number	1	Download in progress.
SESSION_PENDING7+	number	2	Download pending.
SESSION_PAUSED7+	number	3	Download paused.
SESSION_FAILED7+	number	4	Download failure without retry.

request.uploadFile⁹⁺

uploadFile(context: BaseContext, config: UploadConfig): Promise<UploadTask>

Uploads files. This API uses a promise to return the result. You can use on(‘complete’|‘fail’)⁹⁺ to obtain the upload error information.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
context	BaseContext	Yes	Application-based context.
config	UploadConfig	Yes	Upload configurations.

Return value

Type	Description
Promise<UploadTask>	Promise used to return the UploadTask object.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400002	bad file path.

Example

  let uploadTask: request.UploadTask;
  let uploadConfig: request.UploadConfig = {
    url: 'http://www.example.com', // Replace the example with the actual server address.
    header: { 'Accept': '*/*' },
    method: "POST",
    files: [{ filename: "test", name: "test", uri: "internal://cache/test.jpg", type: "jpg" }],
    data: [{ name: "name123", value: "123" }],
  };
  try {
    request.uploadFile(this.context, uploadConfig).then((data: request.UploadTask) => {
      uploadTask = data;
    }).catch((err: BusinessError) => {
      console.error(`Failed to request the upload. Code: ${err.code}, message: ${err.message}`);
    });
  } catch (err) {
    console.error(`Failed to request the upload. err: ${JSON.stringify(err)}`);
  }

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

request.uploadFile⁹⁺

uploadFile(context: BaseContext, config: UploadConfig, callback: AsyncCallback<UploadTask>): void

Uploads files. This API uses an asynchronous callback to return the result. You can use on(‘complete’|‘fail’)⁹⁺ to obtain the upload error information.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
context	BaseContext	Yes	Application-based context.
config	UploadConfig	Yes	Upload configurations.
callback	AsyncCallback<UploadTask>	Yes	Callback used to return the UploadTask object.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400002	bad file path.

Example

  let uploadTask: request.UploadTask;
  let uploadConfig: request.UploadConfig = {
    url: 'http://www.example.com', // Replace the example with the actual server address.
    header: { 'Accept': '*/*' },
    method: "POST",
    files: [{ filename: "test", name: "test", uri: "internal://cache/test.jpg", type: "jpg" }],
    data: [{ name: "name123", value: "123" }],
  };
  try {
    request.uploadFile(this.context, uploadConfig, (err: BusinessError, data: request.UploadTask) => {
      if (err) {
        console.error(`Failed to request the upload. Code: ${err.code}, message: ${err.message}`);
        return;
      }
      uploadTask = data;
    });
  } catch (err) {
    console.error(`Failed to request the upload. err: ${JSON.stringify(err)}`);
  }

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

request.upload^(deprecated)

upload(config: UploadConfig): Promise<UploadTask>

Uploads files. This API uses a promise to return the result.

Model restriction: This API can be used only in the FA model.

NOTE

This API is deprecated since API version 9. You are advised to use request.uploadFile⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
config	UploadConfig	Yes	Upload configurations.

Return value

Type	Description
Promise<UploadTask>	Promise used to return the UploadTask object.

Example

  let uploadTask;
  let uploadConfig = {
    url: 'http://www.example.com', // Replace the example with the actual server address.
    header: { 'Accept': '*/*' },
    method: "POST",
    files: [{ filename: "test", name: "test", uri: "internal://cache/test.jpg", type: "jpg" }],
    data: [{ name: "name123", value: "123" }],
  };
  request.upload(uploadConfig).then((data) => {
    uploadTask = data;
  }).catch((err) => {
    console.error(`Failed to request the upload. Code: ${err.code}, message: ${err.message}`);
  })

request.upload^(deprecated)

upload(config: UploadConfig, callback: AsyncCallback<UploadTask>): void

Uploads files. This API uses an asynchronous callback to return the result.

Model restriction: This API can be used only in the FA model.

NOTE

This API is deprecated since API version 9. You are advised to use request.uploadFile⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
config	UploadConfig	Yes	Upload configurations.
callback	AsyncCallback<UploadTask>	Yes	Callback used to return the UploadTask object.

Example

  let uploadTask;
  let uploadConfig = {
    url: 'http://www.example.com', // Replace the example with the actual server address.
    header: { 'Accept': '*/*' },
    method: "POST",
    files: [{ filename: "test", name: "test", uri: "internal://cache/test.jpg", type: "jpg" }],
    data: [{ name: "name123", value: "123" }],
  };
  request.upload(uploadConfig, (err, data) => {
    if (err) {
      console.error(`Failed to request the upload. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    uploadTask = data;
  });

UploadTask

Implements file uploads. Before using any APIs of this class, you must obtain an UploadTask object through request.uploadFile⁹⁺ in promise mode or request.uploadFile⁹⁺ in callback mode.

on(‘progress’)

on(type: ‘progress’, callback:(uploadedSize: number, totalSize: number) => void): void

Subscribes to upload progress events. This API uses a callback to return the result synchronously.

NOTE

To maintain a balance between power consumption and performance, this API cannot be called when the application is running in the background.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to subscribe to. The value is ‘progress’ (upload progress).
callback	function	Yes	Callback for the upload progress event.

Parameters of the callback function

Name	Type	Mandatory	Description
uploadedSize	number	Yes	Size of the uploaded files, in bytes.
totalSize	number	Yes	Total size of the files to upload, in bytes.

Example

  let upProgressCallback = (uploadedSize: number, totalSize: number) => {
    console.info("upload totalSize:" + totalSize + "  uploadedSize:" + uploadedSize);
  };
  uploadTask.on('progress', upProgressCallback);

on(‘headerReceive’)⁷⁺

on(type: ‘headerReceive’, callback: (header: object) => void): void

Subscribes to HTTP header events for an upload task. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to subscribe to. The value is ‘headerReceive’ (response header).
callback	function	Yes	Callback for the HTTP Response Header event.

Parameters of the callback function

Name	Type	Mandatory	Description
header	object	Yes	HTTP Response Header.

Example

  let headerCallback = (headers: object) => {
    console.info("upOnHeader headers:" + JSON.stringify(headers));
  };
  uploadTask.on('headerReceive', headerCallback);

on(‘complete’|‘fail’)⁹⁺

on(type:‘complete’|‘fail’, callback: Callback<Array<TaskState>>): void;

Subscribes to upload completion or failure events. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to subscribe to. The value ‘complete’ means the upload completion event, and ‘fail’ means the upload failure event.
callback	Callback<Array<TaskState>>	Yes	Callback used to return the result.

Parameters of the callback function

Name	Type	Mandatory	Description
taskstates	Array<TaskState>	Yes	Upload result.

Example

  let upCompleteCallback = (taskStates: Array<request.TaskState>) => {
    for (let i = 0; i < taskStates.length; i++) {
      console.info("upOnComplete taskState:" + JSON.stringify(taskStates[i]));
    }
  };
  uploadTask.on('complete', upCompleteCallback);

  let upFailCallback = (taskStates: Array<request.TaskState>) => {
    for (let i = 0; i < taskStates.length; i++) {
      console.info("upOnFail taskState:" + JSON.stringify(taskStates[i]));
    }
  };
  uploadTask.on('fail', upFailCallback);

off(‘progress’)

off(type: ‘progress’, callback?: (uploadedSize: number, totalSize: number) => void): void

Unsubscribes from upload progress events. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to unsubscribe from. The value is ‘progress’ (upload progress).
callback	function	No	Callback used to return the result. uploadedSize: size of the uploaded files, in B. totalSize: Total size of the files to upload, in B.

Example

  let upProgressCallback = (uploadedSize: number, totalSize: number) => {
    console.info('Upload delete progress notification.' + 'totalSize:' + totalSize + 'uploadedSize:' + uploadedSize);
  };
  uploadTask.off('progress', upProgressCallback);

off(‘headerReceive’)⁷⁺

off(type: ‘headerReceive’, callback?: (header: object) => void): void

Unsubscribes from HTTP header events for an upload task. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to unsubscribe from. The value is ‘headerReceive’ (response header).
callback	function	No	Callback used to return the result. header: HTTP response header.

Example

  let headerCallback = (header: object) => {
    console.info(`Upload delete headerReceive notification. header: ${JSON.stringify(header)}`);
  };
  uploadTask.off('headerReceive', headerCallback);

off(‘complete’|‘fail’)⁹⁺

off(type:‘complete’|‘fail’, callback?: Callback<Array<TaskState>>): void;

Unsubscribes from upload completion or failure events. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to subscribe to. The value ‘complete’ means the upload completion event, and ‘fail’ means the upload failure event.
callback	Callback<Array<TaskState>>	No	Callback used to return the result. taskstates: upload task result.

Example

  let upCompleteCallback = (taskStates: Array<request.TaskState>) => {
    console.info('Upload delete complete notification.');
    for (let i = 0; i < taskStates.length; i++) {
      console.info('taskState:' + JSON.stringify(taskStates[i]));
    }
  };
  uploadTask.off('complete', upCompleteCallback);

  let upFailCallback = (taskStates: Array<request.TaskState>) => {
    console.info('Upload delete fail notification.');
    for (let i = 0; i < taskStates.length; i++) {
      console.info('taskState:' + JSON.stringify(taskStates[i]));
    }
  };
  uploadTask.off('fail', upFailCallback);

delete⁹⁺

delete(): Promise<boolean>

Deletes this upload task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Return value

Type	Description
Promise<boolean>	Promise used to return the task removal result. It returns true if the operation is successful and returns false otherwise.

Example

  uploadTask.delete().then((result: boolean) => {
    console.info('Succeeded in deleting the upload task.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to delete the upload task. Code: ${err.code}, message: ${err.message}`);
  });

delete⁹⁺

delete(callback: AsyncCallback<boolean>): void

Deletes this upload task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<boolean>	Yes	Callback used to return the result.

Example

  uploadTask.delete((err: BusinessError, result: boolean) => {
    if (err) {
      console.error(`Failed to delete the upload task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info('Succeeded in deleting the upload task.');
  });

remove^(deprecated)

remove(): Promise<boolean>

Removes this upload task. This API uses a promise to return the result.

NOTE

This API is deprecated since API version 9. You are advised to use delete⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Return value

Type	Description
Promise<boolean>	Promise used to return the task removal result. It returns true if the operation is successful and returns false otherwise.

Example

  uploadTask.remove().then((result) => {
    console.info('Succeeded in removing the upload task.');
  }).catch((err) => {
    console.error(`Failed to remove the upload task. Code: ${err.code}, message: ${err.message}`);
  });

remove^(deprecated)

remove(callback: AsyncCallback<boolean>): void

Removes this upload task. This API uses an asynchronous callback to return the result.

NOTE

This API is deprecated since API version 9. You are advised to use delete⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<boolean>	Yes	Callback used to return the result.

Example

  uploadTask.remove((err, result) => {
    if (err) {
      console.error(`Failed to remove the upload task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    if (result) {
      console.info('Succeeded in removing the upload task.');
    } else {
      console.error(`Failed to remove the upload task. Code: ${err.code}, message: ${err.message}`);
    }
  });

UploadConfig

Describes the configuration for an upload task.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Name	Type	Mandatory	Description
url	string	Yes	Resource URL.
header	Object	Yes	HTTP or HTTPS header added to an upload request.
method	string	Yes	Request method, which can be ‘POST’ or ‘PUT’. The default value is ‘POST’.
files	Array<File>	Yes	List of files to upload, which is submitted through multipart/form-data.
data	Array<RequestData>	Yes	Form data in the request body.

TaskState⁹⁺

Implements a TaskState object, which is the callback parameter of the on(‘complete’|‘fail’)⁹⁺ and off(‘complete’|‘fail’)⁹⁺ APIs.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Upload

Name	Type	Mandatory	Description
path	string	Yes	File path.
responseCode	number	Yes	Return value of an upload task. The value 0 means that the task is successful, and other values means that the task fails. For details about the task result, see message.
message	string	Yes	Description of the upload task result.

File

Describes the list of files in UploadConfig.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Name	Type	Mandatory	Description
filename	string	Yes	File name in the header when multipart is used.
name	string	Yes	Name of a form item when multipart is used. The default value is file.
uri	string	Yes	Local path for storing files. Only the internal protocol type is supported. In the value, “internal://cache/” must be included. Example: internal://cache/path/to/file.txt
type	string	Yes	Type of the file content. By default, the type is obtained based on the extension of the file name or URI.

RequestData

Describes the form data in UploadConfig.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Name	Type	Mandatory	Description
name	string	Yes	Name of a form element.
value	string	Yes	Value of a form element.

request.downloadFile⁹⁺

downloadFile(context: BaseContext, config: DownloadConfig): Promise<DownloadTask>

Downloads files. This API uses a promise to return the result. You can use on(‘complete’|‘pause’|‘remove’)⁷⁺ to obtain the download task state, which can be completed, paused, or removed. You can also use on(‘fail’)⁷⁺ to obtain the task download error information.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
context	BaseContext	Yes	Application-based context.
config	DownloadConfig	Yes	Download configurations.

Return value

Type	Description
Promise<DownloadTask>	Promise used to return the result.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400001	file operation error.
13400002	bad file path.
13400003	task service ability error.

Example

  let downloadTask: request.DownloadTask;
  try {
    request.downloadFile(this.context, { url: 'https://xxxx/xxxx.hap' }).then((data: request.DownloadTask) => {
      downloadTask = data;
    }).catch((err: BusinessError) => {
      console.error(`Failed to request the download. Code: ${err.code}, message: ${err.message}`);
    })
  } catch (err) {
    console.error(`Failed to request the download. err: ${JSON.stringify(err)}`);
  }

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

request.downloadFile⁹⁺

downloadFile(context: BaseContext, config: DownloadConfig, callback: AsyncCallback<DownloadTask>): void;

Downloads files. This API uses an asynchronous callback to return the result. You can use on(‘complete’|‘pause’|‘remove’)⁷⁺ to obtain the download task state, which can be completed, paused, or removed. You can also use on(‘fail’)⁷⁺ to obtain the task download error information.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
context	BaseContext	Yes	Application-based context.
config	DownloadConfig	Yes	Download configurations.
callback	AsyncCallback<DownloadTask>	Yes	Callback used to return the result.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400001	file operation error.
13400002	bad file path.
13400003	task service ability error.

Example

  let downloadTask: request.DownloadTask;
  try {
    request.downloadFile(this.context, {
      url: 'https://xxxx/xxxxx.hap',
      filePath: 'xxx/xxxxx.hap'
    }, (err: BusinessError, data: request.DownloadTask) => {
      if (err) {
        console.error(`Failed to request the download. Code: ${err.code}, message: ${err.message}`);
        return;
      }
      downloadTask = data;
    });
  } catch (err) {
    console.error(`Failed to request the download. err: ${JSON.stringify(err)}`);
  }

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

request.download^(deprecated)

download(config: DownloadConfig): Promise<DownloadTask>

Downloads files. This API uses a promise to return the result.

NOTE

This API is deprecated since API version 9. You are advised to use request.downloadFile⁹⁺ instead.

Model restriction: This API can be used only in the FA model.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
config	DownloadConfig	Yes	Download configurations.

Return value

Type	Description
Promise<DownloadTask>	Promise used to return the result.

Example

  let downloadTask;
  request.download({ url: 'https://xxxx/xxxx.hap' }).then((data) => {
    downloadTask = data;
  }).catch((err) => {
    console.error(`Failed to request the download. Code: ${err.code}, message: ${err.message}`);
  })

request.download^(deprecated)

download(config: DownloadConfig, callback: AsyncCallback<DownloadTask>): void

Downloads files. This API uses an asynchronous callback to return the result.

NOTE

This API is deprecated since API version 9. You are advised to use request.downloadFile⁹⁺ instead.

Model restriction: This API can be used only in the FA model.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
config	DownloadConfig	Yes	Download configurations.
callback	AsyncCallback<DownloadTask>	Yes	Callback used to return the result.

Example

  let downloadTask;
  request.download({ url: 'https://xxxx/xxxxx.hap', 
  filePath: 'xxx/xxxxx.hap'}, (err, data) => {
    if (err) {
      console.error(`Failed to request the download. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    downloadTask = data;
  });

DownloadTask

Implements file downloads. Before using any APIs of this class, you must obtain a DownloadTask object through request.downloadFile⁹⁺ in promise mode or request.downloadFile⁹⁺ in callback mode.

on(‘progress’)

on(type: ‘progress’, callback:(receivedSize: number, totalSize: number) => void): void

Subscribes to download progress events. This API uses a callback to return the result synchronously.

NOTE

To maintain a balance between power consumption and performance, this API cannot be called when the application is running in the background.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to subscribe to. The value is ‘progress’ (download progress).
callback	function	Yes	Callback used to return the result.

Parameters of the callback function

Name	Type	Mandatory	Description
receivedSize	number	Yes	Size of the downloaded files, in bytes.
totalSize	number	Yes	Total size of the files to download, in bytes.

Example

  let progresCallback = (receivedSize: number, totalSize: number) => {
    console.info("download receivedSize:" + receivedSize + " totalSize:" + totalSize);
  };
  downloadTask.on('progress', progresCallback);

off(‘progress’)

off(type: ‘progress’, callback?: (receivedSize: number, totalSize: number) => void): void

Unsubscribes from download progress events. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to unsubscribe from. The value is ‘progress’ (download progress).
callback	function	No	Callback used to return the result. receivedSize: size of the downloaded files. totalSize: total size of the files to download.

Example

  let progresCallback = (receivedSize: number, totalSize: number) => {
    console.info('Download delete progress notification.' + 'receivedSize:' + receivedSize + 'totalSize:' + totalSize);
  };
  downloadTask.off('progress', progresCallback);

on(‘complete’|‘pause’|‘remove’)⁷⁺

on(type: ‘complete’|‘pause’|‘remove’, callback:() => void): void

Subscribes to download events. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to subscribe to. - ‘complete’: download task completion event. - ‘pause’: download task pause event. - ‘remove’: download task removal event.
callback	function	Yes	Callback used to return the result.

Example

  let completeCallback = () => {
    console.info('Download task completed.');
  };
  downloadTask.on('complete', completeCallback);

  let pauseCallback = () => {
    console.info('Download task pause.');
  };
  downloadTask.on('pause', pauseCallback);

  let removeCallback = () => {
    console.info('Download task remove.');
  };
  downloadTask.on('remove', removeCallback);

off(‘complete’|‘pause’|‘remove’)⁷⁺

off(type: ‘complete’|‘pause’|‘remove’, callback?:() => void): void

Unsubscribes from download events. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to unsubscribe from. - ‘complete’: download task completion event. - ‘pause’: download task pause event. - ‘remove’: download task removal event.
callback	function	No	Callback used to return the result.

Example

  let completeCallback = () => {
    console.info('Download delete complete notification.');
  };
  downloadTask.off('complete', completeCallback);

  let pauseCallback = () => {
    console.info('Download delete pause notification.');
  };
  downloadTask.off('pause', pauseCallback);

  let removeCallback = () => {
    console.info('Download delete remove notification.');
  };
  downloadTask.off('remove', removeCallback);

on(‘fail’)⁷⁺

on(type: ‘fail’, callback: (err: number) => void): void

Subscribes to download failure events. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to subscribe to. The value is ‘fail’ (download failure).
callback	function	Yes	Callback for the download task failure event.

Parameters of the callback function

Name	Type	Mandatory	Description
err	number	Yes	Error code of the download failure. For details about the error codes, see Download Error Codes.

Example

  let failCallback = (err: BusinessError) => {
    console.error(`Failed to download the task. Code: ${err.code}, message: ${err.message}`);
  };
  downloadTask.on('fail', failCallback);

off(‘fail’)⁷⁺

off(type: ‘fail’, callback?: (err: number) => void): void

Unsubscribes from download failure events. This API uses a callback to return the result synchronously.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
type	string	Yes	Type of the event to unsubscribe from. The value is ‘fail’ (download failure).
callback	function	No	Callback used to return the result. err: error code of the download failure.

Example

  let failCallback = (err: BusinessError) => {
    console.error(`Failed to download the task. Code: ${err.code}, message: ${err.message}`);
  };
  downloadTask.off('fail', failCallback);

delete⁹⁺

delete(): Promise<boolean>

Removes this download task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<boolean>	Promise used to return the task removal result.

Example

  downloadTask.delete().then((result: boolean) => {
    console.info('Succeeded in removing the download task.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to remove the download task. Code: ${err.code}, message: ${err.message}`);
  });

delete⁹⁺

delete(callback: AsyncCallback<boolean>): void

Deletes this download task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<boolean>	Yes	Callback used to return the task deletion result.

Example

  downloadTask.delete((err: BusinessError, result: boolean) => {
    if (err) {
      console.error(`Failed to remove the download task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info('Succeeded in removing the download task.');
  });

getTaskInfo⁹⁺

getTaskInfo(): Promise<DownloadInfo>

Obtains the information about this download task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<DownloadInfo>	Promise used to return the download task information.

Example

  downloadTask.getTaskInfo().then((downloadInfo: request.DownloadInfo) => {
    console.info('Succeeded in querying the download task')
  }).catch((err: BusinessError) => {
    console.error(`Failed to query the download task. Code: ${err.code}, message: ${err.message}`)
  });

getTaskInfo⁹⁺

getTaskInfo(callback: AsyncCallback<DownloadInfo>): void

Obtains the information about this download task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<DownloadInfo>	Yes	Callback used to return the download task information.

Example

  downloadTask.getTaskInfo((err: BusinessError, downloadInfo: request.DownloadInfo) => {
    if (err) {
      console.error(`Failed to query the download mimeType. Code: ${err.code}, message: ${err.message}`);
    } else {
      console.info('Succeeded in querying the download mimeType');
    }
  });

getTaskMimeType⁹⁺

getTaskMimeType(): Promise<string>

Obtains the MimeType of this download task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<string>	Promise used to return the MimeType of the download task.

Example

  downloadTask.getTaskMimeType().then((data: string) => {
    console.info('Succeeded in querying the download MimeType');
  }).catch((err: BusinessError) => {
    console.error(`Failed to query the download MimeType. Code: ${err.code}, message: ${err.message}`)
  });

getTaskMimeType⁹⁺

getTaskMimeType(callback: AsyncCallback<string>): void;

Obtains the MimeType of this download task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<string>	Yes	Callback used to return the MimeType of the download task.

Example

  downloadTask.getTaskMimeType((err: BusinessError, data: string) => {
    if (err) {
      console.error(`Failed to query the download mimeType. Code: ${err.code}, message: ${err.message}`);
    } else {
      console.info('Succeeded in querying the download mimeType');
    }
  });

suspend⁹⁺

suspend(): Promise<boolean>

Pauses this download task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<boolean>	Promise used to return the download task pause result.

Example

  downloadTask.suspend().then((result: boolean) => {
    console.info('Succeeded in pausing the download task.');
  }).catch((err: BusinessError) => {
    console.error(`Failed to pause the download task. Code: ${err.code}, message: ${err.message}`);
  });

suspend⁹⁺

suspend(callback: AsyncCallback<boolean>): void

Pauses this download task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<boolean>	Yes	Callback used to return the result.

Example

  downloadTask.suspend((err: BusinessError, result: boolean) => {
    if (err) {
      console.error(`Failed to pause the download task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info('Succeeded in pausing the download task.');
  });

restore⁹⁺

restore(): Promise<boolean>

Resumes this download task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<boolean>	Promise used to return the result.

Example

  downloadTask.restore().then((result: boolean) => {
    console.info('Succeeded in resuming the download task.')
  }).catch((err: BusinessError) => {
    console.error(`Failed to resume the download task. Code: ${err.code}, message: ${err.message}`);
  });

restore⁹⁺

restore(callback: AsyncCallback<boolean>): void

Resumes this download task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<boolean>	Yes	Callback used to return the result.

Example

  downloadTask.restore((err: BusinessError, result: boolean) => {
    if (err) {
      console.error(`Failed to resume the download task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info('Succeeded in resuming the download task.');
  });

remove^(deprecated)

remove(): Promise<boolean>

Removes this download task. This API uses a promise to return the result.

NOTE

This API is deprecated since API version 9. You are advised to use delete⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<boolean>	Promise used to return the task removal result.

Example

  downloadTask.remove().then((result) => {
    console.info('Succeeded in removing the download task.');
  }).catch ((err) => {
    console.error(`Failed to remove the download task. Code: ${err.code}, message: ${err.message}`);
  });

remove^(deprecated)

remove(callback: AsyncCallback<boolean>): void

Removes this download task. This API uses an asynchronous callback to return the result.

NOTE

This API is deprecated since API version 9. You are advised to use delete⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<boolean>	Yes	Callback used to return the task deletion result.

Example

  downloadTask.remove((err, result)=>{
    if(err) {
      console.error(`Failed to remove the download task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info('Succeeded in removing the download task.');
  });

query^(deprecated)

query(): Promise<DownloadInfo>

Queries this download task. This API uses a promise to return the result.

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use getTaskInfo⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<DownloadInfo>	Promise used to return the download task information.

Example

  downloadTask.query().then((downloadInfo) => {    
    console.info('Succeeded in querying the download task.')
  }) .catch((err) => {
    console.error(`Failed to query the download task. Code: ${err.code}, message: ${err.message}`)
  });

query^(deprecated)

query(callback: AsyncCallback<DownloadInfo>): void

Queries this download task. This API uses an asynchronous callback to return the result.

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use getTaskInfo⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<DownloadInfo>	Yes	Callback used to return the download task information.

Example

  downloadTask.query((err, downloadInfo)=>{
    if(err) {
      console.error(`Failed to query the download mimeType. Code: ${err.code}, message: ${err.message}`);
    } else {
      console.info('Succeeded in querying the download task.');
    }
  });

queryMimeType^(deprecated)

queryMimeType(): Promise<string>

Queries the MimeType of this download task. This API uses a promise to return the result.

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use getTaskMimeType⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<string>	Promise used to return the MimeType of the download task.

Example

  downloadTask.queryMimeType().then((data) => {    
    console.info('Succeededto in querying the download MimeType.');
  }).catch((err) => {
    console.error(`Failed to query the download MimeType. Code: ${err.code}, message: ${err.message}`)
  });

queryMimeType^(deprecated)

queryMimeType(callback: AsyncCallback<string>): void;

Queries the MimeType of this download task. This API uses an asynchronous callback to return the result.

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use getTaskMimeType⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<string>	Yes	Callback used to return the MimeType of the download task.

Example

  downloadTask.queryMimeType((err, data)=>{
    if(err) {
      console.error(`Failed to query the download mimeType. Code: ${err.code}, message: ${err.message}`);
    } else {
      console.info('Succeeded in querying the download mimeType.');
    }
  });

pause^(deprecated)

pause(): Promise<void>

Pauses this download task. This API uses a promise to return the result.

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use suspend⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<void>	Promise used to return the download task pause result.

Example

  downloadTask.pause().then((result) => {    
    console.info('Succeeded in pausing the download task.');
  }).catch((err) => {
    console.error(`Failed to pause the download task. Code: ${err.code}, message: ${err.message}`);
  });

pause^(deprecated)

pause(callback: AsyncCallback<void>): void

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use suspend⁹⁺ instead.

Pauses this download task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

  downloadTask.pause((err, result)=>{
    if(err) {
      console.error(`Failed to pause the download task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info('Succeeded in pausing the download task.');
  });

resume^(deprecated)

resume(): Promise<void>

Resumes this download task. This API uses a promise to return the result.

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use restore⁹⁺ instead.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Return value

Type	Description
Promise<void>	Promise used to return the result.

Example

  downloadTask.resume().then((result) => {
    console.info('Succeeded in resuming the download task.')
  }).catch((err) => {
    console.error(`Failed to resume the download task. Code: ${err.code}, message: ${err.message}`);
  });

resume^(deprecated)

resume(callback: AsyncCallback<void>): void

NOTE

This API is supported since API version 7 and is deprecated since API version 9. You are advised to use restore⁹⁺ instead.

Resumes this download task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<void>	Yes	Callback used to return the result.

Example

  downloadTask.resume((err, result)=>{
    if (err) {
      console.error(`Failed to resume the download task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info('Succeeded in resuming the download task.');
  });

DownloadConfig

Defines the download task configuration.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Name	Type	Mandatory	Description
url	string	Yes	Resource URL.
header	Object	No	HTTPS flag header to be included in the download request. The X-TLS-Version parameter in header specifies the TLS version to be used. If this parameter is not set, the CURL_SSLVERSION_TLSv1_2 version is used. Available options are as follows: CURL_SSLVERSION_TLSv1_0 CURL_SSLVERSION_TLSv1_1 CURL_SSLVERSION_TLSv1_2 CURL_SSLVERSION_TLSv1_3 The X-Cipher-List parameter in header specifies the cipher suite list to be used. If this parameter is not specified, the secure cipher suite list is used. Available options are as follows: - The TLS 1.2 cipher suite list includes the following ciphers: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_256_GCM_SHA384, TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,TLS_DSS_RSA_WITH_AES_256_GCM_SHA384, TLS_PSK_WITH_AES_256_GCM_SHA384,TLS_DHE_PSK_WITH_AES_128_GCM_SHA256, TLS_DHE_PSK_WITH_AES_256_GCM_SHA384,TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_PSK_WITH_AES_128_GCM_SHA256,TLS_ECDHE_PSK_WITH_AES_256_GCM_SHA384, TLS_ECDHE_PSK_WITH_AES_128_GCM_SHA256,TLS_DHE_RSA_WITH_AES_128_CCM, TLS_DHE_RSA_WITH_AES_256_CCM,TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_PSK_WITH_AES_256_CCM,TLS_DHE_PSK_WITH_AES_128_CCM, TLS_DHE_PSK_WITH_AES_256_CCM,TLS_ECDHE_ECDSA_WITH_AES_128_CCM, TLS_ECDHE_ECDSA_WITH_AES_256_CCM,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 - The TLS 1.3 cipher suite list includes the following ciphers: TLS_AES_128_GCM_SHA256,TLS_AES_256_GCM_SHA384,TLS_CHACHA20_POLY1305_SHA256,TLS_AES_128_CCM_SHA256 - The TLS 1.3 cipher suite list adds the Chinese national cryptographic algorithm: TLS_SM4_GCM_SM3,TLS_SM4_CCM_SM3
enableMetered	boolean	No	Whether download is allowed on a metered connection. The default value is false. In general cases, a mobile data connection is metered, while a Wi-Fi connection is not. - true: allowed - false: not allowed
enableRoaming	boolean	No	Whether download is allowed on a roaming network. The default value is false. - true: allowed - false: not allowed
description	string	No	Description of the download session.
filePath7+	string	No	Path where the downloaded file is stored. - In the FA model, use context to obtain the cache directory of the application, for example, *\${featureAbility.getContext().getFilesDir()}/test.txt*, and store the file in this directory. - In the stage model, use AbilityContext to obtain the file path, for example, *\${globalThis.abilityContext.tempDir}/test.txt*, and store the file in this path.
networkType	number	No	Network type allowed for the download. The default value is NETWORK_MOBILE and NETWORK_WIFI. - NETWORK_MOBILE: 0x00000001 - NETWORK_WIFI: 0x00010000
title	string	No	Download task name.
background9+	boolean	No	Whether to enable background task notification so that the download status is displayed in the notification panel. The default value is false.

DownloadInfo⁷⁺

Defines the download task information, which is the callback parameter of the getTaskInfo⁹⁺ API.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.MiscServices.Download

Name	Type	Mandatory	Description
downloadId	number	Yes	ID of the download task.
failedReason	number	Yes	Cause of the download failure. The value can be any constant in Download Error Codes.
fileName	string	Yes	Name of the downloaded file.
filePath	string	Yes	URI of the saved file.
pausedReason	number	Yes	Cause of download pause. The value can be any constant in Causes of Download Pause.
status	number	Yes	Download task status code. The value can be any constant in Download Task Status Codes.
targetURI	string	Yes	URI of the downloaded file.
downloadTitle	string	Yes	Name of the download task.
downloadTotalBytes	number	Yes	Total size of the files to download, in bytes.
description	string	Yes	Description of the download task.
downloadedBytes	number	Yes	Size of the files downloaded, in bytes.

Action¹⁰⁺

Defines action options.

System capability: SystemCapability.Request.FileTransferAgent

Name	Value	Description
DOWNLOAD	0	Download.
UPLOAD	1	Upload.

Mode¹⁰⁺

Defines mode options.

System capability: SystemCapability.Request.FileTransferAgent

Name	Value	Description
BACKGROUND	0	Background task.
FOREGROUND	1	Foreground task.

Network¹⁰⁺

Defines network options.

System capability: SystemCapability.Request.FileTransferAgent

Name	Value	Description
ANY	0	Network of any type.
WIFI	1	Wi-Fi network.
CELLULAR	2	Cellular data network.

FileSpec¹⁰⁺

Provides the file information of a table item.

System capability: SystemCapability.Request.FileTransferAgent

Name	Type	Mandatory	Description
path	string	Yes	Relative path in the cache folder of the invoker.
mimeType	string	No	MIME type of the file, which is obtained from the file name.
filename	string	No	File name. The default value is obtained from the file path.
extras	Object	No	Additional information of the file.

FormItem¹⁰⁺

Describes the form item of a task.

System capability: SystemCapability.Request.FileTransferAgent

Name	Type	Mandatory	Description
name	string	Yes	Form parameter name.
value	string |FileSpec |Array<FileSpec>	Yes	Form parameter value.

Config¹⁰⁺

Provides the configuration information of an upload or download task.

System capability: SystemCapability.Request.FileTransferAgent

Name	Type	Mandatory	Description
action	Action	Yes	Task action. - UPLOAD - DOWNLOAD
url	string	Yes	Resource URL. The value contains a maximum of 2048 characters.
title	string	No	Task title. The value contains a maximum of 256 characters. The default value is a null string.
description	string	No	Task description. The value contains a maximum of 1024 characters. The default value is a null string.
mode	Mode	No	Task mode. The default mode is background. - For a foreground task, a callback is used for notification. - For a background task, the system notification and network connection features (detection, recovery, and automatic retry) are provided.
overwrite	boolean	No	Whether to overwrite an existing file during the download. The default value is false. - true: Overwrite the existing file. - false: Do not overwrite the existing file. In this case, the download fails.
method	string	No	Standard HTTP method for the task. The value can be GET, POST, or PUT, which is case-insensitive. - If the task is an upload, use PUT or POST. The default value is PUT. - If the task is a download, use GET or POST. The default value is GET.
headers	object	No	HTTP headers to be included in the task. - If the task is an upload, the default Content-Type is multipart/form-data. - If the task is a download, the default Content-Type is application/json.
data	string |Array&lt;FormItem&gt;	No	Task data. - If the task is a download, the value is a string, typically in JSON format (an object will be converted to a JSON string); the default value is null. - If the task is an upload, the value is Array<FormItem>; the default value is null.
saveas	string	No	Path for storing downloaded files. The options are as follows: - Relative path in the cache folder of the invoker, for example, ”./xxx/yyy/zzz.html” and “xxx/yyy/zzz.html”. - URI (applicable when the application has the permission to access the URI), for example, “datashare://bundle/xxx/yyy/zzz.html”. This option is not supported currently. The default value is a relative path in the cache folder of the application.
network	Network	No	Network used for the task. The default value is ANY (Wi-Fi or cellular).
metered	boolean	No	Whether the task is allowed on a metered connection. The default value is false. - true: The task is allowed on a metered connection. - false: The task is not allowed on a metered connection.
roaming	boolean	No	Whether the task is allowed on a roaming network. The default value is true. - true: The task is allowed on a roaming network. - false: The task is not allowed on a roaming network.
retry	boolean	No	Whether automatic retry is enabled for the task. This parameter is only applicable to background tasks. The default value is true. - true: Automatic retry is enabled for the task. - -false: Automatic retry is not enabled for the task.
redirect	boolean	No	Whether redirection is allowed. The default value is true. - true: Redirection is allowed. - false: Redirection is not allowed.
index	number	No	Path index of the task. It is usually used for resumable downloads. The default value is 0.
begins	number	No	File start point of the task. It is usually used for resumable downloads. The default value is 0. The value is a closed interval. - If the task is a download, the value is obtained by sending an HTTP range request to read the start position when the server starts to download files. - If the task is an upload, the value is obtained at the beginning of the upload.
ends	number	No	File end point of the task. It is usually used for resumable downloads. The default value is -1. The value is a closed interval. - If the task is a download, the value is obtained by sending an HTTP range request to read the end position when the server starts to download files. - If the task is an upload, the value is obtained at the end of the upload.
gauge	boolean	No	Whether to send progress notifications. This parameter applies only to background tasks. The default value is false. - false: Progress notifications are not sent. This means that a notification is sent only to indicate the result of the total task. - true: Progress notifications are sent to indicate the result of each file.
precise	boolean	No	- If this parameter is set to true, the task fails when the file size cannot be obtained. - If this parameter is set to false, the task continues when the file size is set to -1. The default value is false.
token	string	No	Token of the task. If the task has a token configured, this token is required for query of the task. The value contains 8 to 2048 bytes. This parameter is left empty by default.
extras	object	No	Additional information of the task. This parameter is left empty by default.

State¹⁰⁺

Defines the current task status.

System capability: SystemCapability.Request.FileTransferAgent

Name	Value	Description
INITIALIZED	0x00	The task is initialized based on the configuration specified in Config.
WAITING	0x10	The task lacks resources for running or the resources for retries do not match the network status.
RUNNING	0x20	The task is being executed.
RETRYING	0x21	The task has failed at least once and is being executed again.
PAUSED	0x30	The task is suspended and will be resumed later.
STOPPED	0x31	The task is stopped.
COMPLETED	0x40	The task is complete.
FAILED	0x41	The task fails.
REMOVED	0x50	The task is removed.

Progress¹⁰⁺

Describes the data structure of the task progress.

System capability: SystemCapability.Request.FileTransferAgent

Name	Type	Mandatory	Description
state	State	Yes	Current task status.
index	number	Yes	Index of the file that is being processed in the task.
processed	number	Yes	Size of processed data in the current file in the task, in bytes.
sizes	Array<number>	Yes	Size of files in the task, in bytes.
extras	object	No	Extra information of the task, for example, the header and body of the response from the server.

Faults¹⁰⁺

Defines the cause of a task failure.

System capability: SystemCapability.Request.FileTransferAgent

Name	Value	Description
OTHERS	0xFF	Other fault.
DISCONNECTED	0x00	Network disconnection.
TIMEOUT	0x10	Timeout.
PROTOCOL	0x20	Protocol error, for example, an internal server error (500) or a data range that cannot be processed (416).
FSIO	0x40	File system I/O error, for example, an error that occurs during the open, search, read, write, or close operation.

Filter¹⁰⁺

Defines the filter criteria.

System capability: SystemCapability.Request.FileTransferAgent

Name	Type	Mandatory	Description
bundle	string	No	Bundle name of an application. System API: This is a system API.
before	number	No	Unix timestamp of the end time, in milliseconds. The default value is the invoking time.
after	number	No	Unix timestamp of the start time, in milliseconds. The default value is the invoking time minus 24 hours.
state	State	No	Task state.
action	Action	No	Task action. - UPLOAD - DOWNLOAD
mode	Mode	No	Task mode. - FOREGROUND - BACKGROUND

TaskInfo¹⁰⁺

Defines the data structure of the task information for query. The fields available vary depending on the query type.

System capability: SystemCapability.Request.FileTransferAgent

Name	Type	Mandatory	Description
uid	string	No	UID of the application. It is only available for query by system applications. System API: This is a system API.
bundle	string	No	Bundle name of the application. It is only available for query by system applications. System API: This is a system API.
saveas	string	No	Path for storing downloaded files. The options are as follows: - Relative path in the cache folder of the invoker, for example, ”./xxx/yyy/zzz.html” and “xxx/yyy/zzz.html”. - URI (applicable when the application has the permission to access the URI), for example, “datashare://bundle/xxx/yyy/zzz.html”. This option is not supported currently. The default value is a relative path in the cache folder of the application.
url	string	No	Task URL. - It can be obtained through request.agent.show10+, request.agent.touch10+, or request.agent.query10+. When request.agent.query10+ is used, an empty string is returned.
data	string |Array<FormItem>	No	Task value. - It can be obtained through request.agent.show10+, request.agent.touch10+, or request.agent.query10+. When request.agent.query10+ is used, an empty string is returned.
tid	string	Yes	Task ID.
title	string	Yes	Task title.
description	string	Yes	Task description.
action	Action	Yes	Task action. - UPLOAD - DOWNLOAD
mode	Mode	Yes	Task mode. - FOREGROUND - BACKGROUND
mimeType	string	Yes	MIME type in the task configuration.
progress	Progress	Yes	Task progress.
gauge	boolean	Yes	Whether to send progress notifications. This parameter applies only to background tasks.
ctime	number	Yes	Unix timestamp when the task is created, in milliseconds. The value is generated by the system of the current device. Note: When request.agent.search10+ is used for query, this value must be within the range of [after,before] for the task ID to be obtained. For details about before and after, see Filter.
mtime	number	Yes	Unix timestamp when the task state changes, in milliseconds. The value is generated by the system of the current device.
retry	boolean	Yes	Whether automatic retry is enabled for the task. This parameter applies only to background tasks.
tries	number	Yes	Number of retries of the task.
faults	Faults	Yes	Failure cause of the task. - OTHERS: other fault. - DISCONNECT: network disconnection. - TIMEOUT: timeout. - PROTOCOL: protocol error. - FSIO: file system I/O error.
reason	string	Yes	Reason why the task is waiting, failed, stopped, or paused.
extras	string	No	Extra information of the task

Task¹⁰⁺

Implements an upload or download task. Before using this API, you must obtain a Task object, from a promise through request.agent.create¹⁰⁺ or from a callback through request.agent.create¹⁰⁺.

Attributes

Task attributes include the task ID and task configuration.

System capability: SystemCapability.Request.FileTransferAgent

Name	Type	Mandatory	Description
tid	string	Yes	Task ID, which is unique in the system and is automatically generated by the system.
config	Config	Yes	Task configuration.

on(‘progress’)¹⁰⁺

on(event: ‘progress’, callback: (progress: Progress) => void): void

Subscribes to foreground task progress changes.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Type of the event to subscribe to. The value is ‘progress’, indicating the task progress.
callback	function	Yes	Callback used to return the data structure of the task progress.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "taskOnTest",
    value: {
      filename: "taskOnTest.avi",
      mimeType: "application/octet-stream",
      path: "./taskOnTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'taskOnTest',
    description: 'Sample code for event listening',
    mode: request.agent.Mode.FOREGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  let createOnCallback = (progress: request.agent.Progress) => {
    console.info('upload task progress.');
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.on('progress', createOnCallback);
    console.info(`Succeeded in creating a upload task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

on(‘completed’)¹⁰⁺

on(event: ‘completed’, callback: (progress: Progress) => void): void

Subscribes to the foreground task completion event.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Type of the event to subscribe to. The value is ‘completed’, indicating task completion.
callback	function	Yes	Callback used to return the data structure of the task progress.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "taskOnTest",
    value: {
      filename: "taskOnTest.avi",
      mimeType: "application/octet-stream",
      path: "./taskOnTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'taskOnTest',
    description: 'Sample code for event listening',
    mode: request.agent.Mode.FOREGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  let createOnCallback = (progress: request.agent.Progress) => {
    console.info('upload task completed.');
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.on('completed', createOnCallback);
    console.info(`Succeeded in creating a upload task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

on(‘failed’)¹⁰⁺

on(event: ‘failed’, callback: (progress: Progress) => void): void

Subscribes to the foreground task failure event.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Type of the event to subscribe to. The value is ‘failed’, indicating task failure.
callback	function	Yes	Callback used to return the data structure of the task progress.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "taskOnTest",
    value: {
      filename: "taskOnTest.avi",
      mimeType: "application/octet-stream",
      path: "./taskOnTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'taskOnTest',
    description: 'Sample code for event listening',
    mode: request.agent.Mode.FOREGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  let createOnCallback = (progress: request.agent.Progress) => {
    console.info('upload task failed.');
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.on('failed', createOnCallback);
    console.info(`Succeeded in creating a upload task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

off(‘progress’)¹⁰⁺

off(event: ‘progress’, callback?: (progress: Progress) => void): void

Unsubscribes from foreground task progress changes.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Type of the event to subscribe to. The value is ‘progress’, indicating the task progress.
callback	function	No	Callback used to return the data structure of the task progress.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "taskOffTest",
    value: {
      filename: "taskOffTest.avi",
      mimeType: "application/octet-stream",
      path: "./taskOffTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'taskOffTest',
    description: 'Sample code for event listening',
    mode: request.agent.Mode.FOREGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  let createOffCallback = (progress: request.agent.Progress) => {
    console.info('upload task progress.');
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.on('progress', createOffCallback);
    task.off('progress', createOffCallback);
    console.info(`Succeeded in creating a upload task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

off(‘completed’)¹⁰⁺

off(event: ‘completed’, callback?: (progress: Progress) => void): void

Unsubscribes from the foreground task completion event.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Type of the event to subscribe to. The value is ‘completed’, indicating task completion.
callback	function	No	Callback used to return the data structure of the task progress.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "taskOffTest",
    value: {
      filename: "taskOffTest.avi",
      mimeType: "application/octet-stream",
      path: "./taskOffTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'taskOffTest',
    description: 'Sample code for event listening',
    mode: request.agent.Mode.FOREGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  let createOffCallback = (progress: request.agent.Progress) => {
    console.info('upload task completed.');
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.on('completed', createOffCallback);
    task.off('completed', createOffCallback);
    console.info(`Succeeded in creating a upload task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

off(‘failed’)¹⁰⁺

off(event: ‘failed’, callback?: (progress: Progress) => void): void

Unsubscribes from the foreground task failure event.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
event	string	Yes	Type of the event to subscribe to. The value is ‘failed’, indicating task failure.
callback	function	No	Callback used to return the data structure of the task progress.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "taskOffTest",
    value: {
      filename: "taskOffTest.avi",
      mimeType: "application/octet-stream",
      path: "./taskOffTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'taskOffTest',
    description: 'Sample code for event listening',
    mode: request.agent.Mode.FOREGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  let createOffCallback = (progress: request.agent.Progress) => {
    console.info('upload task failed.');
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.on('failed', createOffCallback);
    task.off('failed', createOffCallback);
    console.info(`Succeeded in creating a upload task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

start¹⁰⁺

start(callback: AsyncCallback<void>): void

Starts this task. This API cannot be used to start an initialized task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
callback	function	Yes	Callback used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskStartTest',
    description: 'Sample code for start the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.start((err: BusinessError) => {
      if (err) {
        console.error(`Failed to start the download task, Code: ${err.code}, message: ${err.message}`);
        return;
      }
      console.info(`Succeeded in starting a download task.`);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

start¹⁰⁺

start(): Promise<void>

Starts this task. This API cannot be used to start an initialized task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.Request.FileTransferAgent

Return value

Type	Description
Promise<void>	Promise that returns no value.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskStartTest',
    description: 'Sample code for start the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.start().then(() => {
      console.info(`Succeeded in starting a download task.`);
    }).catch((err: BusinessError) => {
      console.error(`Failed to start the download task, Code: ${err.code}, message: ${err.message}`);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

pause¹⁰⁺

pause(callback: AsyncCallback<void>): void

Pauses this task. This API can be used to pause a background task that is waiting, running, or retrying. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
callback	function	Yes	Callback used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900005	task mode error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskPauseTest',
    description: 'Sample code for pause the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.pause((err: BusinessError) => {
      if (err) {
        console.error(`Failed to pause the download task, Code: ${err.code}, message: ${err.message}`);
        return;
      }
      console.info(`Succeeded in pausing a download task. `);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

pause¹⁰⁺

pause(): Promise<void>

Pauses this task. This API can be used to pause a background task that is waiting, running, or retrying. This API uses a promise to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Return value

Type	Description
Promise<void>	Promise that returns no value.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900005	task mode error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskPauseTest',
    description: 'Sample code for pause the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.pause().then(() => {
      console.info(`Succeeded in pausing a download task. `);
    }).catch((err: BusinessError) => {
      console.error(`Failed to pause the upload task, Code: ${err.code}, message: ${err.message}`);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a upload task, Code: ${err.code}, message: ${err.message}`);
  });

resume¹⁰⁺

resume(callback: AsyncCallback<void>): void

Resumes this task. This API can be used to resume a paused background task. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
callback	function	Yes	Callback used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900005	task mode error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskResumeTest',
    description: 'Sample code for resume the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.resume((err: BusinessError) => {
      if (err) {
        console.error(`Failed to resume the download task, Code: ${err.code}, message: ${err.message}`);
        return;
      }
      console.info(`Succeeded in resuming a download task. `);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

resume¹⁰⁺

resume(): Promise<void>

Resumes this task. This API can be used to resume a paused background task. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.Request.FileTransferAgent

Return value

Type	Description
Promise<void>	Promise that returns no value.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900005	task mode error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskResumeTest',
    description: 'Sample code for resume the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.resume().then(() => {
      console.info(`Succeeded in resuming a download task. `);
    }).catch((err: BusinessError) => {
      console.error(`Failed to resume the download task, Code: ${err.code}, message: ${err.message}`);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

stop¹⁰⁺

stop(callback: AsyncCallback<void>): void

Stops this task. This API can be used to stop a running, waiting, or retrying task. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
callback	function	Yes	Callback used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskStopTest',
    description: 'Sample code for stop the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.stop((err: BusinessError) => {
      if (err) {
        console.error(`Failed to stop the download task, Code: ${err.code}, message: ${err.message}`);
        return;
      }
      console.info(`Succeeded in stopping a download task. `);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

stop¹⁰⁺

stop(): Promise<void>

Stops this task. This API can be used to stop a running, waiting, or retrying task. This API uses a promise to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Return value

Type	Description
Promise<void>	Promise that returns no value.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900007	task state error.

Example

  let config: request.agent.Config = {
    action: request.agent.Action.DOWNLOAD,
    url: 'http://127.0.0.1',
    title: 'taskStopTest',
    description: 'Sample code for stop the download task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "GET",
    data: "",
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    task.stop().then(() => {
      console.info(`Succeeded in stopping a download task. `);
    }).catch((err: BusinessError) => {
      console.error(`Failed to stop the download task, Code: ${err.code}, message: ${err.message}`);
    });
    console.info(`Succeeded in creating a download task. result: ${task.tid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

request.agent.create¹⁰⁺

create(context: BaseContext, config: Config, callback: AsyncCallback<Task>): void

Creates an upload or download task and adds it to the queue. An application can create a maximum of 10 unfinished tasks. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
config	Config	Yes	Task configuration.
context	BaseContext	Yes	Application-based context.
callback	AsyncCallback<Task>	Yes	Callback used to return the configuration about the created task.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400001	file operation error.
13400003	task service ability error.
21900004	application task queue full error.
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "reeateTest",
    value: {
      filename: "reeateTest.avi",
      mimeType: "application/octet-stream",
      path: "./reeateTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'reeateTest',
    description: 'Sample code for reeate task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config, (err: BusinessError, task: request.agent.Task) => {
    if (err) {
      console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in creating a download task. result: ${task.config}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

request.agent.create¹⁰⁺

create(context: BaseContext, config: Config): Promise<Task>

Creates an upload or download task and adds it to the queue. An application can create a maximum of 10 unfinished tasks. This API uses a promise to return the result.

Required permissions: ohos.permission.INTERNET

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
context	BaseContext	Yes	Application-based context.
config	Config	Yes	Task configuration.

Return value

Type	Description
Promise<Task>	Promise used to return the configuration about the created task.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400001	file operation error.
13400003	task service ability error.
21900004	application task queue full error.
21900005	task mode error.

Example

  let attachments: Array<request.agent.FormItem> = [{
    name: "reeateTest",
    value: {
      filename: "reeateTest.avi",
      mimeType: "application/octet-stream",
      path: "./reeateTest.avi",
    }
  }];
  let config: request.agent.Config = {
    action: request.agent.Action.UPLOAD,
    url: 'http://127.0.0.1',
    title: 'reeateTest',
    description: 'Sample code for reeate task',
    mode: request.agent.Mode.BACKGROUND,
    overwrite: false,
    method: "PUT",
    data: attachments,
    saveas: "./",
    network: request.agent.Network.CELLULAR,
    metered: false,
    roaming: true,
    retry: true,
    redirect: true,
    index: 0,
    begins: 0,
    ends: -1,
    gauge: false,
    precise: false,
    token: "it is a secret"
  };
  request.agent.create(this.context, config).then((task: request.agent.Task) => {
    console.info(`Succeeded in creating a download task. result: ${task.config}`);
  }).catch((err) => {
    console.error(`Failed to create a download task, Code: ${err.code}, message: ${err.message}`);
  });

NOTE

For details about how to obtain the context in the example, see Obtaining the Context of UIAbility.

request.agent.remove¹⁰⁺

remove(id: string, callback: AsyncCallback<void>): void

Removes a specified task of the invoker. If the task is being executed, the task is forced to stop. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.
callback	AsyncCallback<void>	Yes	Callback used to return the result. If the operation is successful, err is undefined. Otherwise, err is an error object.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.remove("id", (err: BusinessError) => {
    if (err) {
      console.error(`Failed to removing a download task, Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in creating a download task.`);
  });

request.agent.remove¹⁰⁺

remove(id: string): Promise<void>

Removes a specified task of the invoker. If the task is being executed, the task is forced to stop. This API uses a promise to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.

Return value

Type	Description
Promise<void>	Promise that returns no value.

Error codes

For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.remove("id").then(() => {
    console.info(`Succeeded in removing a download task. `);
  }).catch((err: BusinessError) => {
    console.error(`Failed to remove a download task, Code: ${err.code}, message: ${err.message}`);
  });

request.agent.show¹⁰⁺

show(id: string, callback: AsyncCallback<TaskInfo>): void

Shows the task details based on the task ID. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.
callback	AsyncCallback<TaskInfo>	Yes	Callback used to return task details.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.show("123456", (err: BusinessError, taskInfo: request.agent.TaskInfo) => {
    if (err) {
      console.error(`Failed to show a upload task, Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in showing an upload task.`);
  });

request.agent.show¹⁰⁺

show(id: string): Promise<TaskInfo>

Queries a task details based on the task ID. This API uses a promise to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.

Return value

Type	Description
Promise<TaskInfo>	Promise Promise used to return task details.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.show("123456").then((taskInfo: request.agent.TaskInfo) => {
    console.info(`Succeeded in showing an upload task.`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to show an upload task, Code: ${err.code}, message: ${err.message}`);
  });

request.agent.touch¹⁰⁺

touch(id: string, token: string, callback: AsyncCallback<TaskInfo>): void

Queries the task details based on the task ID and token. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.
token	string	Yes	Token for task query.
callback	AsyncCallback<TaskInfo>	Yes	Callback used to return task details.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.touch("123456", "token", (err: BusinessError, taskInfo: request.agent.TaskInfo) => {
    if (err) {
      console.error(`Failed to touch an upload task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in touching an upload task.`);
  });

request.agent.touch¹⁰⁺

touch(id: string, token: string): Promise<TaskInfo>

Queries the task details based on the task ID and token. This API uses a promise to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.
token	string	Yes	Token for task query.

Return value

Type	Description
Promise<TaskInfo>	Promise Promise used to return task details.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.touch("123456", "token").then((taskInfo: request.agent.TaskInfo) => {
    console.info(`Succeeded in touching a upload task. `);
  }).catch((err: BusinessError) => {
    console.error(`Failed to touch an upload task. Code: ${err.code}, message: ${err.message}`);
  });

request.agent.search¹⁰⁺

search(callback: AsyncCallback<Array<string>>): void

Searches for task IDs based on Filter. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
callback	AsyncCallback<Array<string>>	Yes	Callback used to return task ID matches.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.

Example

  request.agent.search((err: BusinessError, data: Array<string>) => {
    if (err) {
      console.error(`Upload task search failed. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Upload task search succeeded. `);
  });

request.agent.search¹⁰⁺

search(filter: Filter, callback: AsyncCallback<Array<string>>): void

Searches for task IDs based on Filter. This API uses an asynchronous callback to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
filter	Filter	Yes	Filter criteria.
callback	AsyncCallback<Array<string>>	Yes	Callback used to return task ID matches.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.

Example

  let filter: request.agent.Filter = {
    bundle: "com.example.myapplication",
    action: request.agent.Action.UPLOAD,
    mode: request.agent.Mode.BACKGROUND
  }
  request.agent.search(filter, (err: BusinessError, data: Array<string>) => {
    if (err) {
      console.error(`Upload task search failed. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Upload task search succeeded. `);
  });

request.agent.search¹⁰⁺

search(filter?: Filter): Promise<Array<string>>

Searches for task IDs based on Filter. This API uses a promise to return the result.

System capability: SystemCapability.Request.FileTransferAgent

Parameters

Name	Type	Mandatory	Description
filter	Filter	No	Filter criteria.

Return value

Type	Description
Promise<Array<string>>	Promise Promise used to return task ID matches.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.

Example

  let filter: request.agent.Filter = {
    bundle: "com.example.myapplication",
    action: request.agent.Action.UPLOAD,
    mode: request.agent.Mode.BACKGROUND
  }
  request.agent.search(filter).then((data: Array<string>) => {
    console.info(`Upload task search succeeded. `);
  }).catch((err: BusinessError) => {
    console.error(`Upload task search failed. Code: ${err.code}, message: ${err.message}`);
  });

request.agent.query¹⁰⁺

query(id: string, callback: AsyncCallback<TaskInfo>): void

Queries the task details based on the task ID. This API uses an asynchronous callback to return the result.

Required permissions: ohos.permission.DOWNLOAD_SESSION_MANAGER or ohos.permission.UPLOAD_SESSION_MANAGER

System capability: SystemCapability.Request.FileTransferAgent

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.
callback	AsyncCallback<TaskInfo>	Yes	Callback used to return task details.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.query("123456", (err: BusinessError, taskInfo: request.agent.TaskInfo) => {
    if (err) {
      console.error(`Failed to query an upload task. Code: ${err.code}, message: ${err.message}`);
      return;
    }
    console.info(`Succeeded in querying the upload task. Result: ${taskInfo.uid}`);
  });

request.agent.query¹⁰⁺

query(id: string): Promise<TaskInfo>

Queries the task details based on the task ID. This API uses a promise to return the result.

Required permissions: ohos.permission.DOWNLOAD_SESSION_MANAGER or ohos.permission.UPLOAD_SESSION_MANAGER

System capability: SystemCapability.Request.FileTransferAgent

System API: This is a system API.

Parameters

Name	Type	Mandatory	Description
id	string	Yes	Task ID.

Return value

Type	Description
Promise<TaskInfo>	Promise Promise used to return task details.

Error codes For details about the error codes, see Upload and Download Error Codes.

ID	Error Message
13400003	task service ability error.
21900006	task not found error.

Example

  request.agent.query("123456",).then((taskInfo: request.agent.TaskInfo) => {
    console.info(`Succeeded in querying the upload task. Result: ${taskInfo.uid}`);
  }).catch((err: BusinessError) => {
    console.error(`Failed to query the upload task. Code: ${err.code}, message: ${err.message}`);
  });

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