Solutio at Gmail wrote:
Thank you for the advice and introduction to the forum rules. I
"lowercased" the subject.
As for the options available, we would like to avoid sending the same
request to the web server (Apache) if possible. Sure, LWP could emulate
a web client, but our goal is to fork the very same HTTP response that
Apache sends to the browser, into a file, rather than repeating the
request. One of the reasons being that as I mentioned, the data in the
response can already be different.
Allright.
First, you could have a look at
http://httpd.apache.org/docs/2.2/mod/mod_dumpio.html
but I don't think this is really what you want.
If you want to be more selective, and choose to which file you are
dumping these responses, I think you're going to have to use (and
probably create) your own output filter.
For me, the easiest way would be to do that using mod_perl.
Have a look here :
http://perl.apache.org/docs/2.0/api/Apache2/Filter.html
and here
http://perl.apache.org/docs/2.0/user/handlers/filters.html#Adding_OutputFilters_Dynamically
Is that in your league ?
Basically, the idea would be that you have a first module that is
inserted somewhere early in the request processing, and based on some
request characteristic, decides if yes or no this request's output
should be logged. You probably do not want to do this permanently, not
for all requests, because (a) it would have a major impact on server
performance and (b) it would generate huge output volumes.
(That module could just be mod_setenvif, to set a variable if you want
logging).
Second, you would have an output filter that actually does the logging
work, if it has been turned on by the module above.
mod_perl allows you to dynamically insert an output filter just for the
current request, or not, depending.
On the other hand, if your filter is configured to be there statically,
then you would want to set some value whereby it can just return DECLINE
to Apache, so that it will be bypassed for the current request.
Still with me ?
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