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Re: [users@httpd] Faking the CGI content_length environment variable


On Fri, 30 Mar 2018 06:40:57 +0100 Nick Kew wrote:
> > On 29 Mar 2018, at 18:22, Eric Covener <covener@xxxxxxxxx> wrote:
> > 
> > On Thu, Mar 29, 2018 at 11:11 AM, Andrew Beverley <andy@xxxxxxxxxxx> wrote:
> >> Dear all,
> >> 
> >> I am trying to debug a fastcgi server-side application problem, which I
> >> believe was caused by the value of the CONTENT_LENGTH environment
> >> variable not matching the size of the request body sent to the
> >> application.
> >> 
> >> In order to debug, I need to recreate the situation, which was caused
> >> by an unknown client request.
> 
> I haven’t verified whether this’ll do the job for you, but have you tried
> using RequestHeader (mod_headers) to fake it?
> 
> > Something like mod_deflate or mod_substitute changing the length>
> 
> I’ve certainly encountered problems with filters invalidating headers.
> And (in the distant past) fixed some of them.  It’s entirely possible
> there are still unfixed cases.

Thanks for the replies and suggestions. After several more hours of
debugging, it turns out that CONTENT_LENGTH was in fact correct. It was
actually a bug in the web application's framework, which was attempting
to re-read the request's body, after its file pointer was already at
the end (and it therefore read no data the second time).

Many thanks for the help,

Andy

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