httpd-modules-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Chris Kukuchka <>
Subject Re: handling client abort instantly?
Date Tue, 03 Mar 2009 18:41:28 GMT
Frank Meier wrote:
> Hi
> I'm working with a proprietary apache module which communicates (through
> a socket) with another backend application (I have the C source code of
> the module). I've now found out, when the client closes the http
> connection during a request, the module does not "see" that the client
> has disconnected. In some cases the request is just finished, but with
> larger requests (larger amount of data from backend), the module keeps 
> hanging in the ap_rwrite() or ap_rflush() function. This is only 
> resolved if a timeout (default 300s, timeout directive in httpd.conf) 
> occurs. I think the tx-buffer of the socket is filled and then the
> write/flush function blocks.


In Apache 2.2 your module should not need to communicate directly with 
the client.  Instead, pass your output into the bucket brigade.  
Something like this (Note: sock is a socket connection to an external host):

        bb = apr_brigade_create(r->pool, c->bucket_alloc);

        /* Put the body of the reply into the bucket brigade */
        b = apr_bucket_socket_create(sock, c->bucket_alloc);
        b = apr_bucket_eos_create(c->bucket_alloc);
        status = ap_pass_brigade(r->output_filters, bb);
        if (status != APR_SUCCESS) {
            ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "ap_pass_brigade 
            return HTTP_INTERNAL_SERVER_ERROR;

This code passes the socket into the bucket brigade which takes care of 
all the client communication.  In addition, it allows for other modules 
to still act upon the output data.

> I've read in "the Apache Modules Book" (p.138)

Try Nick's book ( ) as it 
is geared toward the newer Apache releases.  Chances are the module you 
inherited has not been properly updated to the new Apache standards.


Chris Kukuchka
Sequoia Group, Inc.

View raw message