Question

我有一个应用程序，它使用keep-alive连接不断轮询远程HTTP API。

很少但偶尔应用程序会在工作一段时间后静默挂起套接字仍处于打开状态，但远程API不返回任何数据。

Httpclient有套接字超时和连接超时，但是如何处理已经连接的超时，套接字仍处于打开状态但是服务器没有返回数据？

netstat -np进程：

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name
tcp        0      0 redactedlocalip:31136       redactedforeignip:80        ESTABLISHED 11145/java

我的httpclient：

SocketConfig socketConfig = SocketConfig.copy(SocketConfig.DEFAULT).setSoTimeout(25000).build();
BasicHttpClientConnectionManager connectionManager = new BasicHttpClientConnectionManager();
connectionManager.setSocketConfig(socketConfig);
return HttpClients
        .custom()
        .setUserAgent(USER_AGENT)
        .setConnectionManager(connectionManager)
        .setRetryHandler(new DefaultHttpRequestRetryHandler())
        .build();

主要线程转储：

"main" #11 prio=5 os_prio=0 tid=0x00007f6b802ce800 nid=0x2b9f runnable [0x00007f6b675ec000]
   java.lang.Thread.State: RUNNABLE
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:150)
        at java.net.SocketInputStream.read(SocketInputStream.java:121)
        at org.apache.http.impl.io.SessionInputBufferImpl.streamRead(SessionInputBufferImpl.java:139)
        at org.apache.http.impl.io.SessionInputBufferImpl.fillBuffer(SessionInputBufferImpl.java:155)
        at org.apache.http.impl.io.SessionInputBufferImpl.readLine(SessionInputBufferImpl.java:284)
        at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:140)
        at org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpResponseParser.java:57)
        at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:261)
        at org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(DefaultBHttpClientConnection.java:165)
        at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:272)
        at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:124)
        at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:271)
        at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:184)
        at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:88)
        at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)
        at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
        at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:107)
        at redacted.app.code.executemyRequest(MyClass.java:117)

我正在使用maven的最新版本＆＃34; org.apache.httpcomponents：httpclient：4.5＆＃34;

Answer 1

问题是表现不佳的HTTP服务器从未响应某些请求但仍继续保持TCP连接并发送/接收保持活动数据包。
Apache HTTPClient没有任何内置的超时来处理这些场景，解决方案是在指定的时间等待后手动调用HTTPRequest $ abort（）方法。
它当然需要从不同的线程调用，因为调用线程将被阻塞等待。

HttpClient 4静默挂在socketRead

1 个答案: