使用场景
使用HttpClient发送post请求时，偶发报错org.apache.http.NoHttpResponseException
异常信息
c.w.e.a.RestConnector] catch IOException, {}
org.apache.http.NoHttpResponseException: 域名xxxx failed to respond
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:143) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:259) ~[httpcore-4.4.16.jar!/:4.4.16]
at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:163) ~[httpcore-4.4.16.jar!/:4.4.16]
at org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:167) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:273) ~[httpcore-4.4.16.jar!/:4.4.16]
at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:125) ~[httpcore-4.4.16.jar!/:4.4.16]
at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:271) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.client.cache.CachingExec.callBackend(CachingExec.java:592) ~[httpclient-cache-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.client.cache.CachingExec.execute(CachingExec.java:269) ~[httpclient-cache-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82) ~[httpclient-4.5.2.jar!/:4.5.2]
at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107) ~[httpclient-4.5.2.jar!/:4.5.2]
at com.wdpr.ee.authz.RestConnector.doPost(RestConnector.java:150) [ticket-authz-library-1.1.1-1.jar!/:1.1.1-1]
at com.wdpr.ee.auth.util.RestTokenValidator.validateToken(RestTokenValidator.java:73) [ticket-authz-library-1.1.1-1.jar!/:1.1.1-1]
at com.wdpr.ee.authz.btoken.BTokenProcessor.validateToken(BTokenProcessor.java:39) [ticket-authz-library-1.1.1-1.jar!/:1.1.1-1]
at com.wdpr.ee.authz.TokenProcessor.processValidation(TokenProcessor.java:91) [ticket-authz-library-1.1.1-1.jar!/:1.1.1-1]
at com.wdpr.ee.authz.AuthFilter.doFilter(AuthFilter.java:47) [ticket-authz-library-1.1.1-1.jar!/:1.1.1-1]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.filters.CorsFilter.handleNonCORS(CorsFilter.java:331) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:158) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) [spring-web-6.1.10.jar!/:6.1.10]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) [spring-web-6.1.10.jar!/:6.1.10]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) [spring-web-6.1.10.jar!/:6.1.10]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) [spring-web-6.1.10.jar!/:6.1.10]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:107) [spring-web-6.1.10.jar!/:6.1.10]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) [spring-web-6.1.10.jar!/:6.1.10]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) [spring-web-6.1.10.jar!/:6.1.10]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) [spring-web-6.1.10.jar!/:6.1.10]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:731) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:389) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:904) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-10.1.25.jar!/:?]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) [tomcat-embed-core-10.1.25.jar!/:?]
at java.lang.Thread.run(Thread.java:833) [?:?]
问题原因
分析过程参考网上搜到的博客# org.apache.http.NoHttpResponseException: failed to respond-服务端响应异常
之所以报这个异常是因为请求的服务器在gateway侧有限流，域名总限流1000，超过了服务器会丢弃请求，导致偶发报这个错。
解决方案
try {
HttpGet request = new HttpGet("http://example.com");
CloseableHttpResponse response = httpClient.execute(request);
// 处理响应...
} catch (NoHttpResponseException e) {
System.err.println("No response received from server.");
//主动关掉已失效的连接
this.getCloseableHttpClient().getConnectionManager().closeExpiredConnections();
//手动 retry一次，也可以过几百毫秒再调用Thread.sleep(100);
response = httpClient.execute(request);
} catch (IOException e) {
e.printStackTrace();
} finally {
// 确保资源被正确释放
}
