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From Ursa Polaris <polaris.u...@gmail.com>
Subject Re: [users@httpd] Apache Randomly Dropping POST Data
Date Wed, 23 Feb 2011 23:53:23 GMT
   This is the first I've heard of mod_cgid, so no we're not using it.
Apparently it IS in our mods-available folder and ready to use though.
I'm using Prefork mode which is the default for Ubuntu's stable Apache
package. Is that a threaded MPM that should make use of mod_cgid?
   Also, do you think it could be beneficial for us to build our own
Apache from source rather than relying on what Ubuntu's placed in it's
stable package library? I notice that it's often several minor
versions behind, not sure if that could be an issue here though since
this issue has been going on for a long time now. =/

On Wed, Feb 23, 2011 at 2:43 PM, Jeff Trawick <trawick@gmail.com> wrote:
> On Wed, Feb 23, 2011 at 5:23 PM, Ursa Polaris <polaris.ursa@gmail.com> wrote:
>
>>   Hopefully that helps give more details and insight as well. I'm
>> totally at a loss with this issue, but it's really bothering myself
>> and my users something fierce. =/ I'm hoping not to be forced to move
>> to nginx, but the lack of support from Apache folks is discouraging
>> (not to mention the AWFUL documentation for mod_perl2)...
>
> Don't take this the wrong way, but within ~4 hours you've had
> responses from two different Apache devs representing many years of
> experience supporting customers on this technology.  That's not so
> shabby.  Note that this is potentially as time consuming for others as
> it has been to you already unless you happen to catch the attention of
> someone who has solved this type of issue before and there's a match
> with their solution and your observations.
>
> Changing some/all of the technology will presumably help, if you're
> willing to risk other problems that have to be solved.  Maybe that is
> cheap to experiment with.  It may be possible not to move totally to
> nginx to eliminate some parts of the technology (see below).
>
> So real CGIs are the ones with the problem.  If you're using a
> threaded MPM, are you using mod_cgid?  (you should be)
>
> mod_dumpio can log the request body/POST data at some intermediate
> point between the network and the CGI.  strace of CGI children (if
> practical to do that) would give another data point.  You could
> temporarily re-implement the most crucial part of the CGI in C just to
> get Perl/CPAN out of the picture -- doesn't have to perform the real
> function; just has to confirm that the POST data got to the CGI
> process.  (I doubt Perl/CPAN is the problem, but then every individual
> part looks unlikely as well.)
>
> Good luck!
>
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