Am 23.10.2019 um 18:33 schrieb Martin T:
Hi,
I have a following Apache virtual host configuration where custom
call_Google_MP_API script receives the IP address and HTTP User-Agent
string as standard input if https://www.example.com/doc.pdf is
downloaded:
<IfModule ssl_module>
<VirtualHost *:443>
/* configuration removed for brevity */
SetEnvIf Request_URI "^/doc\.pdf$" pdfdoc
LogFormat "%h %{User-agent}i" ga
CustomLog "|/usr/local/bin/call_Google_MP_API" ga env=pdfdoc
</VirtualHost>
</IfModule>
As my web server had setenvif_module and log_config_module already
loaded, then I used SetEnvIf directive to set the "pdfdoc" internal
variable when doc.pdf is downloaded, LogFormat directive to set the
nickname "ga" for specific log format and finally CustomLog directive
to pipe this custom log format to call_Google_MP_API script if
"pdfdoc" variable is set, i.e https://www.example.com/doc.pdf URL is
accessed.
While this seems to work fine, then is this the correct/optimal way to
accomplish this?
I'm using Apache version 2.4.38 on Debian 10.
You could also use mod_log_debug:
https://httpd.apache.org/docs/2.4/en/mod/mod_log_debug.html
Despite it's name it is very useful not only for debugging but adding
general custom log messages. The output goes to the ErrorLog though
(which can be a pipe). The log messages generated can include references
to request details, like e.g. %{REMOTE_ADDR} and %{HTTP_USER_AGENT}:
https://httpd.apache.org/docs/2.4/en/expr.html
and can be generated inside Location blocks.
Furthermore one can control, at what point in time during request
processing the message is generated.
Since it goes to the error log, you would need to send it to a piped
process separatig these log lines from the remaining error log lines,
because I guess you want to only send the new log lines to your script
and the remaining ones still to rotatelogs or similar.
Regards,
Rainer
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