Martin Langhoff wrote:
> On 12/11/06, Jakub Narebski <jnareb@xxxxxxxxx> wrote:
>>
>> Even if Apache does execute CGI script to completion every time, it might
>> not send the output of the script, but HTTP 304 Not Modified reply. Might.
>> I don't know if it does.
>
> It is up to the script (CGI or via mod_perl) to set the status to 304
> and finish execution. Just setting the status to 304 does not
> forcefully end execution as you may want to cleanup, log, etc.
I was thinking not about ending execution, but about not sending script
output but sending HTTP 304 Not Modified reply by Apache.
I meant the following sequence of events:
1. Script sends headers, among those Last-Modified and/or ETag
2. Apache scans headers (e.g. to add its own), notices that Last-Modified
is earlier or equal to If-Modified-Since: sent by browser or reverse
proxy, or ETag matches If-None-Match:, and sends 304 instead of script
output
3. Script finishes execution, it's output sent to /dev/null
Again, I don't know if Apache (or any other web server) does that.
--
Jakub Narebski
Poland
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