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网站建设工作流程,百度推广后台登陆,小程序网站开发者利,天津网站制作价格起因 突然有测试小伙伴反馈进公司官网主页会白屏，但只是个例不是普遍现象 查监控发现没监控到异常问题 查了很久（这个很久单指对于线上问题来说）才定位是请求的异常，因为这套系统的异常用的是 ExceptionHandler，这也导…

起因

突然有测试小伙伴反馈进公司官网主页会白屏，但只是个例不是普遍现象
查监控发现没监控到异常问题
查了很久（这个很久单指对于线上问题来说）才定位是请求的异常，因为这套系统的异常用的是 @ExceptionHandler，这也导致问题排查多绕了不少圈子

原因

异常：org.springframework.web.util.NestedServletException : Request processing failed; nested exception is 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.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)at javax.servlet.http.HttpServlet.service(HttpServlet.java:634)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:167)at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.cloud.sleuth.instrument.web.TraceFilter.doFilter(TraceFilter.java:150)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:609)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1623)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)
Caused by: 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.Http11OutputBuffer.checkLengthBeforeWrite(Http11OutputBuffer.java:543)at org.apache.coyote.http11.Http11OutputBuffer.write(Http11OutputBuffer.java:468)at org.apache.coyote.http11.Http11OutputBuffer.write(Http11OutputBuffer.java:454)at org.apache.coyote.http11.Http11OutputBuffer.sendHeader(Http11OutputBuffer.java:414)at org.apache.coyote.http11.Http11Processor.prepareResponse(Http11Processor.java:1200)at org.apache.coyote.AbstractProcessor.action(AbstractProcessor.java:380)at org.apache.coyote.Response.action(Response.java:208)at org.apache.coyote.Response.sendHeaders(Response.java:418)at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:312)at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:293)at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:118)at org.springframework.cloud.sleuth.instrument.web.TraceServletOutputStream.flush(TraceServletOutputStream.java:128)at org.springframework.session.web.http.OnCommittedResponseWrapper$SaveContextServletOutputStream.flush(OnCommittedResponseWrapper.java:455)at com.fasterxml.jackson.core.json.UTF8JsonGenerator.flush(UTF8JsonGenerator.java:1054)at com.fasterxml.jackson.databind.ObjectWriter.writeValue(ObjectWriter.java:953)at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:286)at org.springframework.http.converter.AbstractGenericHttpMessageConverter.write(AbstractGenericHttpMessageConverter.java:106)at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:231)at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:174)at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:81)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:113)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)... 90 more

第一次修复

不就是响应头嘛，先紧急修复下，直接无限大，再说。。。

server:max-http-header-size: -1

第二次修复

改完紧急发布发现没生效。。。不用说肯定掉坑里了。。。看看代码才发现，-1 这个无限大是 tomcat 的玩法，我 Spring 可不惯着你
Spring 底层是根据是不是为 0 做更新的。。

		void customizeTomcat(ServerProperties serverProperties,TomcatEmbeddedServletContainerFactory factory) {if (getBasedir() != null) {factory.setBaseDirectory(getBasedir());}factory.setBackgroundProcessorDelay(Tomcat.this.backgroundProcessorDelay);customizeRemoteIpValve(serverProperties, factory);if (this.maxThreads > 0) {customizeMaxThreads(factory);}if (this.minSpareThreads > 0) {customizeMinThreads(factory);}// 老6了吧int maxHttpHeaderSize = (serverProperties.getMaxHttpHeaderSize() > 0? serverProperties.getMaxHttpHeaderSize() : this.maxHttpHeaderSize);if (maxHttpHeaderSize > 0) {customizeMaxHttpHeaderSize(factory, maxHttpHeaderSize);}if (this.maxHttpPostSize != 0) {customizeMaxHttpPostSize(factory, this.maxHttpPostSize);}if (this.accesslog.enabled) {customizeAccessLog(factory);}if (getUriEncoding() != null) {factory.setUriEncoding(getUriEncoding());}if (serverProperties.getConnectionTimeout() != null) {customizeConnectionTimeout(factory,serverProperties.getConnectionTimeout());}if (this.redirectContextRoot != null) {customizeRedirectContextRoot(factory, this.redirectContextRoot);}if (this.maxConnections > 0) {customizeMaxConnections(factory);}if (this.acceptCount > 0) {customizeAcceptCount(factory);}if (!ObjectUtils.isEmpty(this.additionalTldSkipPatterns)) {factory.getTldSkipPatterns().addAll(this.additionalTldSkipPatterns);}}

server:#  Maximum size in bytes of the HTTP message headermax-http-header-size: 1048576

彻底修复

紧急处理完，开始正式挖掘问题处理
前后端大佬仔细排查去除了三个前端监控组件，彻底解决问题

一个小记录

其实我就是想记录下这个类：org.springframework.boot.autoconfigure.web.ServerProperties
工作中用的最多缺一直忽视的配置类。。。线上不少关于请求的异常都可以在这里找到配置处理
类似的：上传文件大小、响应头大小、请求数等等

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