NoHttpResponseException

[Joan Balagueró]

Hello,

 

I’m occassionally getting the following error (HC 4.3.4)

 

There was no reply from the server
org.apache.http.NoHttpResponseException: 10.150.3.159:80 failed to respond

        at
org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpRes
ponseParser.java:143)

        at
org.apache.http.impl.conn.DefaultHttpResponseParser.parseHead(DefaultHttpRes
ponseParser.java:57)

        at
org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.ja
va:260)

        at
org.apache.http.impl.DefaultBHttpClientConnection.receiveResponseHeader(Defa
ultBHttpClientConnection.java:161)

        at
org.apache.http.impl.conn.CPoolProxy.receiveResponseHeader(CPoolProxy.java:1
53)

        at
org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestEx
ecutor.java:271)

        at
org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.jav
a:123)

        at
org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:25
4)

        at
org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)

        at
org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86)

        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:106)

        at
com.ventusproxy.proxy.services.http.HttpInstance.sendRequest(HttpInstance.ja
va:610)

      ( . . . )

 

I’ve read some posts about it. It seems that the main reason is that
keep-alive connections are dropped on the server side. In my case I don’t
have keep alive enabled (every request initiates a new connection to the
server). Furthermore I have the following retryHandler:

 

public class RequestRetryHandler implements HttpRequestRetryHandler 

{

private int maxExecutionCount;

 

public RequestRetryHandler(int maxExecutionCount)           {
this.setMaxExecutionCount(maxExecutionCount); }

public void setMaxExecutionCount(int maxExecutionCount) {
this.maxExecutionCount = maxExecutionCount; }

 public boolean retryRequest(IOException exception, int executionCount,
HttpContext context) 

 {

  if (executionCount > this.maxExecutionCount) return false;

 

  if ( (exception instanceof InterruptedIOException) || (exception
instanceof UnknownHostException) || (exception instanceof ConnectException)
|| (exception instanceof SSLException) ) return false;

  

  return (!(HttpClientContext.adapt(context).getRequest() instanceof
HttpEntityEnclosingRequest));

}

}

 

I realize it’s a server problem (it’s probably dropping connections), but is
there anything else I can do to minimize this error (in addition to disable
keepAlive and enable a retryHandler)?

 

Thanks,

 

Joan.