Connection Timeout doesn't work where there's an UnknownHostException
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Key: HTTPCLIENT-938
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-938
Project: HttpComponents HttpClient
Issue Type: Bug
Components: HttpClient, HttpConn
Affects Versions: 3.1 Final
Environment: Linux OS
Reporter: Oz Levanon
When trying to connect to an unresolvable host (using the host name, not the
IP), it seems that none of the timeouts has any effect.
On one of my machines the UnknownHostConnection is only thrown after 20
seconds, even though my timeouts are set to 1 second.
Please note that the duration of the timeout changes between computers. On my
Windows XP machine it takes only 500ms to throw the exception, but on a Linux
machine (probably with a more problematic DNS) it takes 20 seconds.
This issue may be somehow related to issue 478
(https://issues.apache.org/jira/browse/HTTPCLIENT-478), but I couldn't find any
help in any of the solutions there.
I suspect the problem occurs when Java's InetSocketAddress constructor calls
InetAddress.getByName(String) after DefaultProtocolSocketFactory.createSocket
tries to create a new socket.
Example code:
--------------------
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
public class HttpConnectionTimeoutProblem
{
public static void main(String[] args)
{
long start = System.currentTimeMillis();
try
{
HttpClient client = new HttpClient();
client.getParams().setConnectionManagerTimeout(1000);
client.getParams().setSoTimeout(1000);
GetMethod method = new
GetMethod("http://www.987aksj239874nkjhse.gov";);
method.getParams().setSoTimeout(1000);
int httpRc = client.executeMethod(method);
System.out.println("httpRc = " + httpRc);
}
catch (Exception e)
{
long time = System.currentTimeMillis() - start;
System.out.println("Exception caught after " + time +
": " + e);
e.printStackTrace();
}
}
}
The output from this is (on my Linux machine)
--------------------------------------------------------------
log4j:WARN No appenders could be found for logger
(org.apache.commons.httpclient.HttpClient).
log4j:WARN Please initialize the log4j system properly.
Exception caught after 20593: java.net.UnknownHostException:
www.987aksj239874nkjhse.gov
java.net.UnknownHostException: www.987aksj239874nkjhse.gov
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:177)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:520)
at java.net.Socket.connect(Socket.java:470)
at java.net.Socket.<init>(Socket.java:367)
at java.net.Socket.<init>(Socket.java:240)
at
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:79)
at
org.apache.commons.httpclient.protocol.DefaultProtocolSocketFactory.createSocket(DefaultProtocolSocketFactory.java:121)
at
org.apache.commons.httpclient.HttpConnection.open(HttpConnection.java:706)
at
org.apache.commons.httpclient.HttpMethodDirector.executeWithRetry(HttpMethodDirector.java:386)
at
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:170)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:396)
at
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:324)
at
HttpConnectionTimeoutProblem.main(HttpConnectionTimeoutProblem.java:17)
Thanks
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