SO_TIMEOUT on a request level

[Moshe Ben-Shoham-2]

Hi,

 

The scenario is as follows: I'm doing two consecutive requests to the
same host, using a multi-threaded (or thread safe) connection pool
manager. The first invocation has a timeout of 10s and the second has a
timeout of 30s.

 

In version 3.1 of HttpClient all works well, but in 4.0 I get a timeout
exception in the second request, after ~10 seconds, which means the
first timeout is used.

 

Looking at the code, I see that in version 3.1, the
HttpMethodDirector.executeWithRetry() method invokes a method named
applyConnectionParams() that took care of setting the timeout taken from
the request on the socket.

 

But in version 4.0, the only place I see the timeout is set on the
socket is when DefaultRequestDirector.execute(HttpHost, HttpRequest,
HttpContext) opens a connection using the managedConn.open() method.
Since the connection is reused between the requests, the second request
uses a socket with a timeout of the first request. As a (bad)
workaround, I put on the HttpClient instance a ConnectionReuseStrategy
that always says no to reusing the connection, so a new connection is
created for the second request, with the required timeout.

 

Am I missing something?

 

Thanks,

Moshe.


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[olegk]

Moshe Ben-Shoham wrote:

> Hi,
>
>  
>
> The scenario is as follows: I'm doing two consecutive requests to the
> same host, using a multi-threaded (or thread safe) connection pool
> manager. The first invocation has a timeout of 10s and the second has a
> timeout of 30s.
>
>  
>
> In version 3.1 of HttpClient all works well, but in 4.0 I get a timeout
> exception in the second request, after ~10 seconds, which means the
> first timeout is used.
>
>  
>
> Looking at the code, I see that in version 3.1, the
> HttpMethodDirector.executeWithRetry() method invokes a method named
> applyConnectionParams() that took care of setting the timeout taken from
> the request on the socket.
>
>  
>
> But in version 4.0, the only place I see the timeout is set on the
> socket is when DefaultRequestDirector.execute(HttpHost, HttpRequest,
> HttpContext) opens a connection using the managedConn.open() method.
> Since the connection is reused between the requests, the second request
> uses a socket with a timeout of the first request. As a (bad)
> workaround, I put on the HttpClient instance a ConnectionReuseStrategy
> that always says no to reusing the connection, so a new connection is
> created for the second request, with the required timeout.
>
>  
>
> Am I missing something?
>
>  
>
> Thanks,
>
> Moshe.
>

Hi Moshe

This is definitely a bug. Please raise a JIRA for this issue:

https://issues.apache.org/jira/browse/HTTPCLIENT

As a somewhat cleaner workaround you can obtain the actual connection
from the execution context and reset the timeout on that connection.
This at least will work for the response body.

---
DefaultHttpClient httpclient = new DefaultHttpClient();

HttpGet request = new HttpGet("http://www.google.com/");
HttpContext context = new BasicHttpContext();

HttpResponse rsp = httpclient.execute(request, context);
HttpClientConnection conn = (HttpClientConnection) context.getAttribute(
         ExecutionContext.HTTP_CONNECTION);
conn.setSocketTimeout(1000);

HttpEntity entity = rsp.getEntity();

System.out.println("----------------------------------------");
System.out.println(rsp.getStatusLine());
System.out.println("----------------------------------------");

if (entity != null) {
     entity.consumeContent();
}
---

Oleg

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