spring InfoReceiver 源码
spring InfoReceiver 代码
文件路径：/spring-websocket/src/main/java/org/springframework/web/socket/sockjs/client/InfoReceiver.java
/*
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.web.socket.sockjs.client;
import java.net.URI;
import org.springframework.http.HttpHeaders;
import org.springframework.lang.Nullable;
/**
* A component that can execute the SockJS "Info" request that needs to be
* performed before the SockJS session starts in order to check server endpoint
* capabilities such as whether the endpoint permits use of WebSocket.
*
* <p>Typically {@link XhrTransport} implementations are also implementations
* of this contract.
*
* @author Rossen Stoyanchev
* @since 4.1
* @see AbstractXhrTransport
*/
public interface InfoReceiver {
/**
* Perform an HTTP request to the SockJS "Info" URL.
* and return the resulting JSON response content, or raise an exception.
* <p>Note that as of 4.2 this method accepts a {@code headers} parameter.
* @param infoUrl the URL to obtain SockJS server information from
* @param headers the headers to use for the request
* @return the body of the response
*/
String executeInfoRequest(URI infoUrl, @Nullable HttpHeaders headers);
}
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