[SOLVED] mod_rewrite problem with RewriteCond

SkyerSK · 05-22-2011, 06:05 AM

Hello,
recently I have started playing with mod_rewrite, and now I am trying to accomplish following:

I'd like to use redirection for SEO friendly URLs:

Code:

RewriteRule ^userstats/?$ page.php?id=3

Also, to avoid users trying to get pages by themselves:

Code:

RewriteCond %{QUERY_STRING} id=[0-9]+
RewriteRule ^[a-zA-Z\.]+$ index.php

I understand that first rule should be placed below this one, as it would rewrite all pages,
but it does not work at all. Also, I tried adding L flag, to both rules, but it does not work.

Could anyone please point me to right solution, or some information about application of RewriteRules/Conditions? I don't know what's wrong there.

Thanks in advance

EricTRA · 05-22-2011, 09:53 AM

Hi,

Maybe dumb question but did you enable the rewrite engine with:

Code:

RewriteEngine On

as the first line? Without enabling the rewrite engine nothing gets processed.
I'd also make the URL rewrite conditions case insensitive with NC ([NC]) and the last rule always needs [L] as termination to indicate the end of the rewrite conditions and rules.

Kind regards,

Eric

SkyerSK · 05-22-2011, 10:39 AM

Thanks for your answer,
yes, RewriteEngine is turned on, also I have RewriteBase set. Rewriting itself works without any problems, I'm just getting some misbehavior (caused by my lack of knowledge) with rules stated in my first post.

SkyerSK · 05-22-2011, 11:33 AM

Still can't get satisfying results, rules are:

Code:

RewriteEngine on
RewriteBase /

RewriteCond %{QUERY_STRING} id=[0-9]+
RewriteRule [a-z0-9]+ index.php?q=redirected_by_condition [NC,R]

RewriteRule ^userstats$ index.php?id=2 [L]

As far as I understand RewriteRules, processing should start like this:
If query_string contains "id=" and some number, proceed with next rule. There anything is rewritten to index.php?q=redirected_by_condition.
If not, continue with next rule. Then, if URI Request is userstats, requested URL will be index.php?id=2 and there will be no further rewriting.

Why does it continue rewriting?

Thanks

Nominal Animal · 05-22-2011, 05:36 PM

Quote:

Originally Posted by SkyerSK

Code:

RewriteCond %{QUERY_STRING} id=[0-9]+
RewriteRule [a-z0-9]+ index.php?q=redirected_by_condition [NC,R]

Do you really want to replace the first alphanumeric sequence in the URL by index.php?q=redirected_by_condition? Assuming you wish to redirect any URLs with ID queries to the index.php in the same directory, I'd use

Code:

RewriteCond %{QUERY_STRING} ^id=([0-9]+) [OR]
RewriteCond %{QUERY_STRING} &id=([0-9]+)
RewriteRule /+[^/]*\.[^/]*$ /index.php?q=redir&oldid=%1 [R=301,L]
RewriteCond %{QUERY_STRING} ^id=([0-9]+) [OR]
RewriteCond %{QUERY_STRING} &id=([0-9]+)
RewriteRule /+([^\./]*)/*$ /$1/index.php?q=redir&oldid=%1 [R=301,L]

The first triplet replaces everything that contains a full dot after the last slash (including the slash), if the query contains an id parameter with a value that begins with a number. The second triplet does the same for URLs that end with a (dotless) directory name.

The R=301 flag tells mod_rewrite to do a permanent redirection (HTTP 301), and the L flag will tell mod_rewrite to not apply any further rules.

Quote:

Originally Posted by SkyerSK

Why does it continue rewriting?

Because you did not tell it to stop; you didn't use the L flag. Also, the RewriteCond only applies to the very next RewriteRule.

SkyerSK · 05-23-2011, 11:24 AM

Thanks much for your answer,
the code I posted was just as an example, what I really want to do is: (as I stated in first post)
1. Make URLs SEO friendly, by redirecting from easy-to-remember text urls:

Code:

RewriteRule ^userstats/?$ page.php?id=3

2. If user tries to write id explicitly, redirect him to index.

Code:

RewriteCond %{QUERY_STRING} id=[0-9]+
RewriteRule ^[a-zA-Z\.]+$ index.php

So the whole .htaccess looks like this:

Code:

RewriteEngine on
RewriteBase /
RewriteCond %{QUERY_STRING} id=[0-9]+
RewriteRule [a-z0-9]+ index.php?q=redirected_by_condition [NC,R]

RewriteRule ^calendar$ index.php?id=2 [L]

The problem is that it does not work - I did not know, that "RewriteRule ^calendar$ index.php?id=2 [L]" generates absolutely new request (probably, looks like that), and that way the URL is being rewritten, just as when id parameter was stated explicitely. Is there any way to avoid this?

Thanks, I am newbie with mod_rewrite.

Nominal Animal · 05-23-2011, 01:30 PM

Quote:

Originally Posted by SkyerSK

Thanks much for your answer,
the code I posted was just as an example, what I really want to do is: (as I stated in first post)
1. Make URLs SEO friendly, by redirecting from easy-to-remember text urls:

Code:

RewriteRule ^userstats/?$ page.php?id=3

2. If user tries to write id explicitly, redirect him to index.

Code:

RewriteCond %{QUERY_STRING} id=[0-9]+
RewriteRule ^[a-zA-Z\.]+$ index.php

Ah, now I understand your problem.

You need to do proxy requests, and skip the rewrite rules for subrequests. Try this in a .htaccess file:

Code:

RewriteBase /baseURL
RewriteRule ^/*userstats/*$ /page.php?id=3 [P,NC]
RewriteCond &%{QUERY_STRING} &id=([0-9]+)
RewriteRule ^/*[^/]+$ /index.php?oldid=%1 [NS,R=302,L]

You also need to make sure mod_proxy and mod_proxy_http are loaded in your Apache configuration. (I recommend explicitly setting ProxyRequests Off and not using any ProxyPass directives; that is, you don't need to enable any of the proxy features, just make sure the modules are loaded.)

SkyerSK · 05-24-2011, 01:20 PM

Thanks for your post,
I have my hands off the computer where web sites are being hosted, I should get to it by tomorrow. Sorry for keeping you waiting.

SkyerSK · 05-27-2011, 01:39 PM

Alright, thanks,
it seems to be working now (I'm about to play with it to see how exactly it works). Problem solved.

And sorry for keeping you waiting again.