Closing a timed out socket takes the same amount of time as the connection took
to time out, so the perceived timeout for an application thread is 2 x timeout.
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Key: HTTPCLIENT-1084
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1084
Project: HttpComponents HttpClient
Issue Type: Bug
Affects Versions: 3.1 Final
Reporter: Daniel Webster
Priority: Minor
Closing a timed out socket takes the same amount of time as the connection took
to time out, so the perceived timeout for an application thread is 2 x timeout.
For example, say you set the timeout value for a connection using
HttpConnectionManager connectionManager = new
MultiThreadedHttpConnectionManager();
HttpConnectionManagerParams params = connectionManager.getParams();
if(params == null){
params = new HttpConnectionManagerParams();
}
params.setParameter(HttpConnectionManagerParams.SO_TIMEOUT,
socketTimeout);
params.setParameter(HttpConnectionManagerParams.CONNECTION_TIMEOUT,
connectionTimeout);
connectionManager.setParams(params);
return connectionManager;
If the client attempts to open a connection to a server and requests data, and
the server fails to respond for 10 seconds, the HttpClient will actually throw
a timeout exception to code using HttpClient after 20 seconds (2x10). The call
pattern seems to be
after 10 seconds, a ConnectionTimeoutException is thrown inside
org.apache.commons.httpclient.HttpConnection.open(). The open() method then
catches that exception (line 748) and calls closeSocketAndStreams() (on line
751). The closeSocketAndStream() method then takes another "timeout" seconds.
This time is consumed when closing the output stream (lines 1222-1231).
To fix this problem on our project, we switched the ordering of the socket
shutdown and the stream shutdown (as shown in the attached patch).
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