Re: [users@httpd] Mod RewriteRule Help : Accepting Variable Number Of Arguments

Sat, 31 Mar 2007 17:35:14 -0800 

Hi Dragon,

Thank you for the reply.  Greatly appreciated.
Your suggestion was helpful in this learning process. Unfortunately the result is the same error I have been getting.
mod_rewrite: maximum number of internal redirects reached. Assuming configuration error. Use 'RewriteOptions MaxRedirects' to increase the limit if neccessary. 

It looks like it should work, but alas, no dice.
What is interesting to note is that if *ONLY* the longest rule exists, and I pass it the expected number of arguments, it is incorrectly parsed by mod_rewrite:
RewriteRule ^(.*)/(.*)/(.*)/(.*)/(.*)/?$ /index.php?section=$1&page=$2&mode=$3&item=$4&action=$5 [L] 

Parsing http://domain.com/section/page/mode/item/action/

Results:
_REQUEST[section] = "section/page"
_REQUEST[page] = "mode"
_REQUEST[item] = "action"
_REQUEST[action] = empty
Its as if there is some bug in parsing the first argument where it passes the first and second argument to $1.
So then I changed it so I have all five rules modified where the first argument is staticly defined and pass it a new URL that I thought would match. This also give unexpected results: 

RewriteRule ^superuser/(.*)/?$ /index.php?section=superuser&page=$1 [L]
RewriteRule ^superuser/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2 [L] RewriteRule ^superuser/(.*)/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2&item=$3 [L] RewriteRule ^superuser/(.*)/(.*)/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2&item=$3&action=$4 [L] 

Parsing: http://domain.com/superuser/page/mode/item/action/

It redirects section=superuser&page=page/mode/item/action/

In all cases, the second rule catches all tests.
I reverse the order of the Rewrite Rules in .htaccess, once again it resorts to the other strange parsing:
RewriteRule ^superuser/(.*)/(.*)/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2&item=$3&action=$4 [L] RewriteRule ^superuser/(.*)/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2&item=$3 [L] RewriteRule ^superuser/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2 [L] 
RewriteRule ^superuser/(.*)/?$ /index.php?section=superuser&page=$1 [L]

Parsing http://domain.com/superuser/page/mode/item/action/
results in redirecting to section=superuser&page=page/mode&mode=item&item=action&action=empty where it mis-parses the first argument and passes what I consider $1 and $2 together as $1, leaving the last item blank.
Seems like a bug to me but don't quote me on that. I have been around and not a 'noob' but then again I am no mod_rewrite/Apache module guru. I wonder if the last /? in the rule is causing that. 

THE GOOD NEWS

I get closest to working with the following rules in this order.
RewriteRule ^superuser/(.*)/(.*)/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2&item=$3&action=$4 [L] RewriteRule ^superuser/(.*)/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2&item=$3 [L] RewriteRule ^superuser/(.*)/(.*)/?$ /index.php?section=superuser&page=$1&mode=$2 [L] 
RewriteRule ^superuser/(.*)/?$ /index.php?section=superuser&page=$1 [L]
Though http://domain.com/superuser/page/mode/item/action/ gets misdirected, If I take off the trailing slash, the rule works as expected. Also, the shorter rules work when I start deleting things from the end of the URL request regardless of the trailing /. To surmise: 

http://domain.com/superuser/page/mode/item/action/ gets misdirected
http://domain.com/superuser/page/mode/item/action works
http://domain.com/superuser/page/mode/item/ works
http://domain.com/superuser/page/mode/item works
http://domain.com/superuser/page/mode/ works
http://domain.com/superuser/page/mode works
http://domain.com/superuser/page/ works
http://domain.com/superuser/page works
For the record, My Apache is Apache/1.3.37 (Unix) mod_fastcgi/2.4.2 mod_perl/1.29 PHP/5.2.1 

My initial config when I set Apache was a no-frills DSO:
./configure --prefix=/usr/local/apache --enable-module=so
Final note, it seems taking /? out of the rules seems to make no difference, as rules function the same when it is removed. 

Any ideas?

Thanks for your time,

Kris


From: Dragon <[EMAIL PROTECTED]>
Reply-To: users@httpd.apache.org
To: users@httpd.apache.org
Subject: Re: [EMAIL PROTECTED] Mod RewriteRule Help : Accepting Variable Number Of Arguments 
Date: Sat, 31 Mar 2007 09:56:41 -0700

Kristopher Yates did speak thusly:

Hello,

Here is an example URL I'm trying to create a RewriteRule for:

index.php?section=help&page=test&mode=IN&item=4&action=edit
I have a rule that works when the request URL contains the appropriate number of arguments but does not work when there are fewer arguments than the Rule expects. I thought by creating multiple (similar) rules would resolve but no luck. Here is what I have that works as long as I pass all required arguments:
RewriteRule ^(.*)/(.*)/(.*)/(.*)/(.*)$ /index.php?section=$1&page=$2&mode=$3&item=$4&action=$5
The above rule correctly passes http://domain.com/help/test/IN/4/edit to my script as /index.php?section=help&page=test&mode=IN&item=4&action=edit .
I tried creating 5 rules so that, if Apache saw fewer arguments, it would go down to the next rule but that didnt work like I thought it would:
RewriteRule ^(.*)/(.*)/(.*)/(.*)/(.*)$ /index.php?section=$1&page=$2&mode=$3&item=$4&action=$5 RewriteRule ^(.*)/(.*)/(.*)/(.*)$ /index.php?section=$1&page=$2&mode=$3&item=$4 
RewriteRule ^(.*)/(.*)/(.*)$ /index.php?section=$1&page=$2&mode=$3
RewriteRule ^(.*)/(.*)$ /index.php?section=$1&page=$2
RewriteRule ^(.*)$ /index.php?section=$1
How do I write the rule(s) so that, if fewer arguments are passed, it will still work? 

Any help would be greatly appreciated.

---------------- End original message. ---------------------
OK, I will take a shot at this... though I am not very experienced with mod_rewrite, I do know fair amount about regular expressions. 

mod_rewrite documentation is here:
http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html
First off, from the documentation of mod_rewrite, the rules are applied in order as defined so they should fall through from one to the next if a higher one does not apply. So it seems like your scheme should work, why it doesn't is unknown to me. I am not sure about this but you might want to try reversing the order of your tests, do the smallest number of arguments first.
I think you probably ought to also use the last flag on each rule too so it does not skip to the next if it matches. (Now that I think about it, this may well be the problem here).
One thing you probably ought to account for is that you are making a big assumption in your RE here. That assumption is that there will never be a trailing slash on any of the URLs, this may not be a valid assumption. To fix that you need to make a change to each RE prior to the end of line anchor to indicate either 0 or 1 slashes may exist. For example: 

        RewriteRule ^(.*)/?$ /index.php?section=$1

This rule would match both of these:
        http://domain.com/help
        http://domain.com/help/

So here is how I suggest you try the rules:

RewriteRule ^(.*)/?$ /index.php?section=$1 [L]
RewriteRule ^(.*)/(.*)/?$ /index.php?section=$1&page=$2 [L]
RewriteRule ^(.*)/(.*)/(.*)/?$ /index.php?section=$1&page=$2&mode=$3 [L]
RewriteRule ^(.*)/(.*)/(.*)/(.*)/?$ /index.php?section=$1&page=$2&mode=$3&item=$4 [L] RewriteRule ^(.*)/(.*)/(.*)/(.*)/(.*)/?$ /index.php?section=$1&page=$2&mode=$3&item=$4&action=$5 [L] 


Let me know if this helps. I am curious to see if I was on the right track.


Dragon

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