spring RelativeRedirectFilter 源码
spring RelativeRedirectFilter 代码
文件路径：/spring-web/src/main/java/org/springframework/web/filter/RelativeRedirectFilter.java
/*
* Copyright 2002-2018 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.filter;
import java.io.IOException;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.http.HttpStatus;
import org.springframework.http.HttpStatusCode;
import org.springframework.util.Assert;
/**
* Overrides {@link HttpServletResponse#sendRedirect(String)} and handles it by
* setting the HTTP status and "Location" headers, which keeps the Servlet
* container from re-writing relative redirect URLs into absolute ones.
* Servlet containers are required to do that but against the recommendation of
* <a href="https://tools.ietf.org/html/rfc7231#section-7.1.2"> RFC 7231 Section 7.1.2</a>,
* and furthermore not necessarily taking into account "X-Forwarded" headers.
*
* <p><strong>Note:</strong> While relative redirects are recommended in the
* RFC, under some configurations with reverse proxies they may not work.
*
* @author Rob Winch
* @author Rossen Stoyanchev
* @since 4.3.10
*/
public class RelativeRedirectFilter extends OncePerRequestFilter {
private HttpStatusCode redirectStatus = HttpStatus.SEE_OTHER;
/**
* Set the default HTTP Status to use for redirects.
* <p>By default this is {@link HttpStatus#SEE_OTHER}.
* @param status the 3xx redirect status to use
*/
public void setRedirectStatus(HttpStatusCode status) {
Assert.notNull(status, "Property 'redirectStatus' is required");
Assert.isTrue(status.is3xxRedirection(), "Not a redirect status code");
this.redirectStatus = status;
}
/**
* Return the configured redirect status.
*/
public HttpStatusCode getRedirectStatus() {
return this.redirectStatus;
}
@Override
protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
FilterChain filterChain) throws ServletException, IOException {
response = RelativeRedirectResponseWrapper.wrapIfNecessary(response, this.redirectStatus);
filterChain.doFilter(request, response);
}
}
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