Java 为什么Tomcat抱怨试图向响应头写入太多内容？

我的服务作为一个代理服务器，它将使用代理发送GET请求，在头中添加一些信息，并将其返回给客户端。但有时我在编写额外的标题时会出现以下错误：

org.apache.coyote.http11.HeadersTooLargeException: An attempt was made to write more data to the response headers than there was room available in the buffer. Increase maxHttpHeaderSize on the connector or write less data into the response headers.
at org.apache.coyote.http11.AbstractOutputBuffer.checkLengthBeforeWrite(AbstractOutputBuffer.java:546)
at org.apache.coyote.http11.AbstractOutputBuffer.write(AbstractOutputBuffer.java:510)
at org.apache.coyote.http11.AbstractOutputBuffer.write(AbstractOutputBuffer.java:427)
at org.apache.coyote.http11.AbstractOutputBuffer.sendHeader(AbstractOutputBuffer.java:393)
at org.apache.coyote.http11.AbstractHttp11Processor.prepareResponse(AbstractHttp11Processor.java:1468)
at org.apache.coyote.http11.AbstractHttp11Processor.action(AbstractHttp11Processor.java:764)
at org.apache.coyote.Response.action(Response.java:172)
at org.apache.coyote.http11.AbstractOutputBuffer.doWrite(AbstractOutputBuffer.java:185)
at org.apache.coyote.Response.doWrite(Response.java:504)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:383)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:342)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:413)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:401)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:91)
at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)
at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:282)
at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125)
at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:135)
at java.io.OutputStreamWriter.write(OutputStreamWriter.java:220)
at java.io.Writer.write(Writer.java:157)
at org.springframework.util.StreamUtils.copy(StreamUtils.java:106)
at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:106)
at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:40)
at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:179)
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148)
at org.springframework.web.servlet.mvc.method.annotation.HttpEntityMethodProcessor.handleReturnValue(HttpEntityMethodProcessor.java:124)
at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:69)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:745)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:686)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)

我觉得这很奇怪，因为我唯一添加到头中的是{“proxy_error”：“false”}。我是不是碰巧给一个网站发送了一个GET，它返回了太多的标题，以至于我无法再写一个？或者，我从不清除缓冲区（每次复制它们的头时，我都会向随机URL发送数千个get请求），这不知何故导致缓冲区变得太大了

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在泽西岛我也遇到过。我在

异常

上设置了一个断点，等待Eclipse在其上中断，遍历堆栈和参数，发现：

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我启用了Jersey跟踪，它将调试信息输出到头文件中。这可能是相当多的数据，难怪我会出现这个错误。

您正在复制所有现有的标题，不是吗？是的，这就是问题所在吗？我能换一种方式吗？据我所知，你是在原地复制。有没有办法复制不在原地的？如果我能让HttpServletResponse指向CloseableHttpResponse httpResponse，然后我就可以添加PROXY\u ERROR\u KEY，false并完成它，那就太好了，但我不知道怎么做。

@RequestMapping(value = {"/hi"}, method = RequestMethod.GET)
@ResponseBody
public String test(final String url, HttpServletResponse response) {
    CloseableHttpResponse httpResponse = sendGetRequest(url);

    response.setHeader(PROXY_ERROR_KEY, "false");

    // Copy the fetched headers
    for (Header header : httpResponse.getAllHeaders()) {
        response.addHeader(header.getName(), header.getValue());
    }
    response.setStatus(httpResponse.getStatusLine().getStatusCode());
    return "hello";
}