Hey, Would you like to work at Home ?? Just click here No need to pay, just register free and activate your account and get data Entry Work at your Home.

Friday, August 22, 2008

Mod Rewrite Tips and Examples

For example, to limit the next 5 RewriteRules to only be applied to .html and .php files, you can use the following code, which tests if the url does not end in .html or .php and if it doesn’t, it will skip the next 5 RewriteRules.



RewriteRule !\.(html|php)$ - [S=5]

RewriteRule ^.*-(vf12|vf13|vf5|vf35|vf1|vf10|vf33|vf8).+$ - [S=1]



.htaccess rewrite examples should begin with:


Options +FollowSymLinks



RewriteEngine On

RewriteBase /


Require the www


Options +FollowSymLinks

RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_HOST} !^www\.askapache\.com$ [NC]

RewriteRule ^(.*)$ http://www.askapache.com/$1 [R=301,L]


Loop Stopping Code


Sometimes your rewrites cause infinite loops, stop it with one of these rewrite code snippets.


RewriteCond %{REQUEST_URI} ^/(stats/|missing\.html|failed_auth\.html|error/).* [NC]

RewriteRule .* - [L]



RewriteCond %{ENV:REDIRECT_STATUS} 200

RewriteRule .* - [L]


Cache-Friendly File Names


This is probably my favorite, and I use it on every site I work on. It allows me to update my javascript and css files in my visitors cache’s simply by naming them differently in the html, on the server they stay the same name. This rewrites all files for /zap/j/anything-anynumber.js to /zap/j/anything.js and /zap/c/anything-anynumber.css to /zap/c/anything.css


RewriteRule ^zap/(j|c)/([a-z]+)-([0-9]+)\.(js|css)$ /zap/$1/$2.$4 [L]



SEO friendly link for non-flash browsers


When you use flash on your site and you properly supply a link to download flash that shows up for non-flash aware browsers, it is nice to use a shortcut to keep your code clean and your external links to a minimum. This code allows me to link to site.com/getflash/ for non-flash aware browsers.


RewriteRule ^getflash/?$ http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash [NC,L,R=307]



Removing the Query_String


On many sites, the page will be displayed for both page.html and page.html?anything=anything, which hurts your SEO with duplicate content. An easy way to fix this issue is to redirect external requests containing a query string to the same uri without the query_string.


RewriteCond %{THE_REQUEST} ^GET\ /.*\;.*\ HTTP/

RewriteCond %{QUERY_STRING} !^$

RewriteRule .* http://www.askapache.com%{REQUEST_URI}? [R=301,L]


Sending requests to a php script


This .htaccess rewrite example invisibly rewrites requests for all Adobe pdf files to be handled by /cgi-bin/pdf-script.php


RewriteRule ^(.+)\.pdf$ /cgi-bin/pdf-script.php?file=$1.pdf [L,NC,QSA]


Setting the language variable based on Client


For sites using multiviews or with multiple language capabilities, it is nice to be able to send the correct language automatically based on the clients preferred language.


RewriteCond %{HTTP:Accept-Language} ^.*(de|es|fr|it|ja|ru|en).*$ [NC]

RewriteRule ^(.*)$ - [env=prefer-language:%1]



Deny Access To Everyone Except PHP fopen


This allows access to all files by php fopen, but denies anyone else.


RewriteEngine On

RewriteBase /

RewriteCond %{THE_REQUEST} ^.+$ [NC]

RewriteRule .* - [F,L]


Deny access to anything in a subfolder except php fopen


This can be very handy if you want to serve media files or special downloads but only through a php proxy script.


RewriteEngine On

RewriteBase /

RewriteCond %{THE_REQUEST} ^[A-Z]{3,9}\ /([^/]+)/.*\ HTTP [NC]

RewriteRule .* - [F,L]


Require no www


Options +FollowSymLinks

RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_HOST} !^askapache\.com$ [NC]

RewriteRule ^(.*)$ http://askapache.com/$1 [R=301,L]


Check for a key in QUERY_STRING


Uses a RewriteCond Directive to check QUERY_STRING for passkey, if it doesn’t find it it redirects all requests for anything in the /logged-in/ directory to the /login.php script.


RewriteEngine On

RewriteBase /

RewriteCond %{QUERY_STRING} !passkey

RewriteRule ^/logged-in/(.*)$ /login.php [L]


Removes the QUERY_STRING from the URL


If the QUERY_STRING has any value at all besides blank than the?at the end of /login.php? tells mod_rewrite to remove the QUERY_STRING from login.php and redirect.


RewriteEngine On

RewriteBase /

RewriteCond %{QUERY_STRING} .

RewriteRule ^login.php /login.php? [L]


Fix for infinite loops


An error message related to this isRequest exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace.or you may seeRequest exceeded the limit,probable configuration error,Use 'LogLevel debug' to get a backtrace, orUse 'LimitInternalRecursion' to increase the limit if necessary


RewriteCond %{ENV:REDIRECT_STATUS} 200

RewriteRule .* - [L]


External Redirect .php files to .html files (SEO friendly)


RewriteRule ^(.*)\.php$ /$1.html [R=301,L]


Internal Redirect .php files to .html files (SEO friendly)


Redirects all files that end in .html to be served from filename.php so it looks like all your pages are .html but really they are .php


RewriteRule ^(.*)\.html$ $1.php [R=301,L]



block access to files during certain hours of the day


Options +FollowSymLinks

RewriteEngine On

RewriteBase /

# If the hour is 16 (4 PM) Then deny all access

RewriteCond %{TIME_HOUR} ^16$

RewriteRule ^.*$ - [F,L]



Rewrite underscores to hyphens for SEO URL


Converts all underscores “_” in urls to hyphens “-” for SEO benefits… See the full article for more info.


Options +FollowSymLinks

RewriteEngine On

RewriteBase /



RewriteRule !\.(html|php)$ - [S=4]

RewriteRule ^([^_]*)_([^_]*)_([^_]*)_([^_]*)_(.*)$ $1-$2-$3-$4-$5 [E=uscor:Yes]

RewriteRule ^([^_]*)_([^_]*)_([^_]*)_(.*)$ $1-$2-$3-$4 [E=uscor:Yes]

RewriteRule ^([^_]*)_([^_]*)_(.*)$ $1-$2-$3 [E=uscor:Yes]

RewriteRule ^([^_]*)_(.*)$ $1-$2 [E=uscor:Yes]



RewriteCond %{ENV:uscor} ^Yes$

RewriteRule (.*) http://d.com/$1 [R=301,L]



Require the www without hardcoding


Options +FollowSymLinks

RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_HOST} !^www\.[a-z-]+\.[a-z]{2,6} [NC]

RewriteCond %{HTTP_HOST} ([a-z-]+\.[a-z]{2,6})$ [NC]

RewriteRule ^/(.*)$ http://%1/$1 [R=301,L]



Require no subdomain


RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_HOST} \.([a-z-]+\.[a-z]{2,6})$ [NC]

RewriteRule ^/(.*)$ http://%1/$1 [R=301,L]


Require no subdomain


RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_HOST} \.([^\.]+\.[^\.0-9]+)$

RewriteRule ^(.*)$ http://%1/$1 [R=301,L]



Redirecting Wordpress Feeds to Feedburner


Full article:Redirecting Wordpress Feeds to Feedburner


RewriteEngine On

RewriteBase /

RewriteCond %{REQUEST_URI} ^/feed\.gif$

RewriteRule .* - [L]



RewriteCond %{HTTP_USER_AGENT} !^.*(FeedBurner|FeedValidator) [NC]

RewriteRule ^feed/?.*$ http://feeds.feedburner.com/apache/htaccess [L,R=302]



RewriteCond %{REQUEST_FILENAME} !-f

RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule . /index.php [L]



Only allow GET and PUT Request Methods


Article: Request Methods


RewriteEngine On

RewriteBase /

RewriteCond %{REQUEST_METHOD} !^(GET|PUT)

RewriteRule .* - [F]


Prevent Files image/file hotlinking and bandwidth stealing


RewriteEngine On

RewriteBase /

RewriteCond %{HTTP_REFERER} !^$

RewriteCond %{HTTP_REFERER} !^http://(www\.)?askapache.com/.*$ [NC]

RewriteRule \.(gif|jpg|swf|flv|png)$ /feed/ [R=302,L]


Stop browser prefetching


RewriteEngine On

SetEnvIfNoCase X-Forwarded-For .+ proxy=yes

SetEnvIfNoCase X-moz prefetch no_access=yes



# block pre-fetch requests with X-moz headers

RewriteCond %{ENV:no_access} yes

RewriteRule .* - [F,L]


Make a prefetching hint for Firefox.


Header append Link "

</index.htm>

; rel=prefetch"


This module uses a rule-based rewriting engine (based on a regular-expression parser) to rewrite requested URLs on the fly. It supports an unlimited number of rules and an unlimited number of attached rule conditions for each rule, to provide a really flexible and powerful URL manipulation mechanism. The URL manipulations can depend on various tests, of server variables, environment variables, HTTP headers, or time stamps. Even external database lookups in various formats can be used to achieve highly granular URL matching.


This module operates on the full URLs (including the path-info part) both in per-server context (httpd.conf) and per-directory context (.htaccess) and can generate query-string parts on result. The rewritten result can lead to internal sub-processing, external request redirection or even to an internal proxy throughput.


Further details, discussion, and examples, are provided in the detailed mod_rewrite documentation.

3 comments:

Azizul Islam’s Weblog said...

Hello Dear,
Thanks for such a nice article. I have problem with .htaccess. My problem is: I want create a directory using XAMP/PHP and mysql. When user click category or sub-category I want hide the query string date.
Example my current page status http://localhost/directory/category.php?catid=1

Now want to show only http://localhost/directory/category

This is My code in .htaccess file.

Options +FollowSymLinks
RewriteEngine on
RewriteRule http://localhost/category/(.*)/(.*)/$ /directory/category.php?catid=$1
RewriteRule http://localhost/subcategory/(.*)/(.*)/$ /directory/subcategory.php?$1=$2

but it dosen't work.

Please Help me.

Regards,
Azizul Islam

Dharmendra Singh said...

I'm looking for help to make below stuff working ....Basically i want that Chinese language browser can access my site with password only.


SetEnvIf HTTP_ACCEPT_LANGUAGE ^zh.* I_AM_CHINESE

Order allow,deny
Allow from all
Deny from I_AM_CHINESE
AuthName "Authorized Users Only."
AuthType Basic
AuthUserFile .htpasswd
require valid user
satisfy any

PHP Funda said...

Hello You can provide correct Rule as given below

Options +FollowSymLinks
RewriteEngine on
RewriteRule /category/(.*)/(.*)/$ /directory/category.php?catid=$1
RewriteRule /subcategory/(.*)/(.*)/$ /directory/subcategory.php?$1=$2

Your Ad Here