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From Justin Erenkrantz <>
Subject Re: Add ETag to ap_scan_script_header_err_core()
Date Wed, 22 Sep 2004 05:07:24 GMT
--On Tuesday, September 21, 2004 3:48 PM -0700 Michael Corcoran 
<> wrote:

> I've been trying to find a solution to a problem that mod_cache has with
> handling Etag's properly.  I'm working with Apache 2.0.51.  Below is a
> diff to ./server/util_script.c that seems to fix the problem...

FWIW, I committed some changes to mod_cache earlier this afternoon (about 10 
minutes after you sent this email, actually) that fix this by not depending 
upon ap_scan_script_header_err().  Using ap_scan_script_header_err() was just 
wrong for mod_cache as it has these types of goofy side effects.  Now, 
everything goes into r->headers_out not r->err_headers_out.

So, I'd recommend trying a httpd 2.0 HEAD snapshot.

> function sticks the Etag value in the r->err_headers_out table.  Then,
> mod_cache later calls ap_meets_conditions() which expects to find an
> Etag value in r->headers_out.

I will comment that it's possible ap_meets_conditions() should look in 
r->err_headers_out.  But, I'm not completely sure if that's right either.

Regardless, please try out the latest CVS and see if it is fixed.  It may get 
merged back to APACHE_2_0_BRANCH and into 2.0.52, but I'd like confirmation 
that what we have now fixes these types of problems before starting the 
backport process.  -- justin

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