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frogstarr78
Asked: 2011-04-28 13:29:50 +0800 CST

Rewrite Conditions Backreferences passed to all rules?

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Is there a way to get back references for Rewrite Conditions to be passed to all subsequent rewrite rules?

Here's an example:

RewriteEngine On    
RewriteCond %{HTTP_HOST} (bob).localhost [NC]    
RewriteRule ^/where/? /index.php\?user_name=%1
RewriteRule ^/who/? /index.php\?user_name=%1

In this example I would expect this behavior:

http://bob.localhost/where => http://bob.localhost/where/index.php?user_name=bob
http://bob.localhost/who   => http://bob.localhost/who/index.php?usern_ame=bob

But for the second rule I receive http://bob.localhost/who/index.php?user_name= instead.

I've tried this on several different distro's using Apache 2.2.17

http apache-2.2 url rewrite mod-rewrite

2 Answers

  1. Best Answer

    Conditions only apply to the very next rule. You'll need to repeat the condition in order for it to apply to another rule:

    RewriteCond %{HTTP_HOST} (bob).localhost [NC]    
RewriteRule ^/where/? /index.php\?user_name=%1
RewriteCond %{HTTP_HOST} (bob).localhost [NC]    
RewriteRule ^/who/? /index.php\?user_name=%1

    In your example, if your request's HTTP_HOST value doesn't match (bob).localhost, your request will skip the ^/where/? rule (even if it matches), but can use the ^/who/? rule.

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  2. As DerfK indicates, rewritecond is for only one rewrite rule.

    You might consider an alternate strategem however, setting and reading environment variables.

    # this grabby rewrite will match anything, 
# *and* set 'bob' in a custom rewrite environment variable 
# it uses 'next' with the 'no sub requests' caveat to avoid loops 
RewriteCond %{HTTP_HOST} (bob).localhost [NC]
RewriteRule ^(.*)$ - [env=host_uname:%1] [N,NS]

# All these rules should then be evaluated, 
# in the 'next' pass - with the 'host_uname' env variable available   
RewriteRule ^/where/? /index.php\?user_name=%{ENV:host_uname}
RewriteRule ^/who/? /index.php\?user_name=%{ENV:host_uname}
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