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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 SUNOS

apache

apache(1M)						  System Administration Commands						apache(1M)

NAME

       apache - Apache hypertext transfer protocol server overview

DESCRIPTION

	apache	consists  of a main server daemon, loadable server modules, some additional support utilities, configuration files, and documenta-
       tion.

FILES

       The apache HTTPD server is integrated with Solaris.

       The following files specify the installation locations for apache:

       /etc/apache	       Contains server configuration files.

			       A newly-installed server must be manually configured before use. Typically this involves copying httpd.conf-example
			       to the httpd.conf file and making local configuration adjustments.

       /usr/apache/bin	       Contains the httpd executable as well as other utility programs.

       /usr/apache/htdocs      Contains  the  Apache  manual  in HTML format. This documentation is accessible by way of a link on the server test
			       page that gets installed upon fresh installation.

       /usr/apache/include     Contains the Apache header files, which are needed for building various optional server extensions with apxs(8)

       /usr/apache/jserv       Contains documention for the mod_jserv java servlet module. Documention can be read with a web  browser	using  the
			       url:

			       file:/usr/apache/jserv/docs/index.html

       /usr/apache/libexec     Contains loadable modules (DSOs) supplied with the server. Any modules which are added using apxs(8)are also copied
			       into this directory.

       /usr/apache/man	       Contains man pages for the server, utility programs, and mod_perl.

			       Add this directory to your MANPATH to read the Apache man pages. See NOTES.

       /usr/apache/perl5       Contains the modules and library files used by the mod_perl extension to Apache.

       /var/apache/cgi-bin     Default location for the CGI scripts.

			       This can be changed by altering the httpd.conf file and restarting the server.

       /var/apache/htdocs      Default document root.

			       This can be changed by altering the httpd.conf file and restarting the server.

       /var/apache/icons       Icons used by the server.

			       This normally shouldn't need to be changed.

       /var/apache/logs        Contains server log files.

			       The formats, names, and locations of the files in this directory can be altered by various configuration directives
			       in the httpd.conf file.

       /var/apache/proxy       Directory used to cache pages if the caching feature of mod_proxy is enabled in the httpd.conf file.

			       The location of the cache can also be changed by changing the proxy configuration in the httpd.conf file.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWapchr 		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWapchu 		   |
       +-----------------------------+-----------------------------+
       |			     |SUNWapchd 		   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

       http://www.apache.org

NOTES

       In addition to the documentation and man pages included with Solaris, more information is available at http://www.apache.org

       The  Apache  man pages are provided with the programming modules. To view the manual pages for the Apache modules with the man command, add
       /usr/apache/man to the MANPATH environment  variable. See man(1) for  more information. Running catman(1M) on the Apache  manual  pages	is
       not supported.

SunOS 5.10							    8 Aug 2000								apache(1M)
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