
Although there might be nothing wrong with throwing queries around
looking for commonalities and good base searches, we’ve already seen in the IIS
section that it’s more effective to consult the server software itself for search
clues. Most Apache installations rely on a configuration file called httpd.conf.
Searching through Apache 2.0.40’s httpd.conf file reveals the location of the
HTML templates for error messages.The referenced files (which follow) are
located in the Web root directory—such as
/error/http_BAD_REQUEST.html.var, which refers to the /var/www/error
directory on the file system:
ErrorDocument 400 /error/HTTP_BAD_REQUEST.html.var
ErrorDocument ...