Question

我的服务充当代理服务器，它将使用代理发送GET请求，将一些信息添加到标头中，然后将其返回给客户端。但有时我在编写额外的标题时会出现此错误：

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)

我发现这很奇怪，因为我在标题中添加的唯一内容是{“proxy_error”：“false”}。我刚刚发送一个GET到一个网站，该网站返回了很多标题，我不能写另一个标题？或者我在某种程度上导致缓冲区变得太大而永远不会清除它（我每次向其标题复制时都会向随机网址发送数千个GET请求）。

@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";
}

Answer 1

在泽西岛也发生在我身上。我在Exception上设置了一个断点，等待Eclipse打破它，遍历堆栈和参数，发现：

我启用了Jersey跟踪，它将调试信息输出到标题中。它可能是相当多的数据，毫不奇怪我得到了这个错误。

为什么Tomcat会抱怨尝试为响应头写太多？

1 个答案: