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Full Discussion: mod_rewrite RewriteMap - possible to 404?
Top Forums Web Development mod_rewrite RewriteMap - possible to 404? Post 302307811 by sneakyimp on Thursday 16th of April 2009 11:22:10 AM
Old 04-16-2009
mod_rewrite RewriteMap - possible to 404?
In my strenuous efforts to get SEO-friendly urls, I'm using a rewrite map in my apache setup:

Code:
RewriteEngine on
RewriteOptions MaxRedirects=5

RewriteMap seo prg:/Applications/MAMP/htdocs/map.php

#map requests for the original file to the new SEO friendly urls
RewriteCond %{REQUEST_FILENAME} ^/education/db/ug/ug
RewriteCond %{DOCUMENT_ROOT}%{REQUEST_FILENAME} -f
RewriteCond %{QUERY_STRING} ^(.+)$
RewriteRule ^/education/db/ug/(ug.*)$ ${seo:$1?%1}? [L,R=301]

My rewrite map is a PHP script which checks my database for an id value supplied in the query string and if anything is found, it returns an SEO-friendly text string which i inject into the URL in order to turn a url like this:
Code:
http://mydomain.com/r.php?id=1234

into one like this:
Code:
http://mydomain.com/amazing-and-useful-url/1234

I'm wondering a few things:
1) If an id is not found in my database, can I send a 404 signal from my map program? If so, how?
2) What's the story with RewriteLock. The documentation is rather tightlipped about the need for it. Am I to understand that if I use a PHP script (or any other program) as a rewrite map that I need a RewriteLock file? What are the required permissions on this file? Can I assume that apache needs to read/write it and will maintain anything it might contain?
3) I'm getting quite concerned about a lengthy list of RewriteCond and RewriteRule items in this particular apache conf file. Is there any way to have apache skip the remainder of rules in this conf file if one fails?
4) is PHP a poor choice for this application? If my map daemon crashes, won't part of my site will go dark?
 

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LEARN ABOUT REDHAT

webserver

WEBSERVER(1)							       mrtg							      WEBSERVER(1)

NAME

       webserver - hints for web server configuration

SYNOPSIS

       If you want people to actually see the results of your network monitoring efforts you will need a webserver.

       This document lists some configuration hints for webservers. Contributions welcome.

APACHE

       Configuring mod_expire

       A big issue with mrtg monitoring data is the expiery time.  All these nice graphs you can create are only valid for a short time.  If you
       do not take special action some webbrowsers will not notice this and you may end up with people seeing old data because of caching issues.

       The apache module mod_expire allows you to setup special expiery properties for individual file.

       Here is an example for how this may look for an mrtg web directory.  The configuration directives can be stored into a .htaccess file.

	############################################################
	# Example .htaccess for use with apache-1.2 and mod_expire.
	# (mod_expire come with apache-1.2 but you have to explicitly
	# activate it when compiling the httpd ...)
	#############################################################
	#
	<Files "*-day.png">
	ExpiresActive On		  # enable expirations
	# five minutes
	ExpiresDefault M300
	</Files>

	<Files "*-week.png">
	ExpiresActive On
	ExpiresDefault M1800
	</Files>

	<Files "*-month.png">
	ExpiresActive On
	ExpiresDefault M7200
	</Files>

	<Files "*-year.png">
	ExpiresActive On
	ExpiresDefault M86400
	</Files>

	<Files "*.html">
	ExpiresActive On
	ExpiresDefault M300
	</Files>

	# index.html is not automatically generated
	<Files "index.html">
	ExpiresActive Off
	</Files>

AUTHOR

       Unknown

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