Comments on: Crazy Advanced Mod_Rewrite Debug Tutorial

By: Scott Laughton

Scott Laughton — Wed, 17 Apr 2013 01:34:00 +0000

What a great service to the developer community!! Thanks heaps!!

By: Stephan H. Wissel

Stephan H. Wissel — Wed, 05 Dec 2012 17:40:17 +0000

I'm trying to use ErrorDocument and mod_rewrite to do a lookup in a map first to see if there is a known replacement URL (I asked on severfault). My /var/www/errormap.map file looks like this:

/demo.html /test/found.html (before I compiled it). My apache settings like this:

ErrorDocument 404 /error.html
RewriteEngine on
RewriteMap lowercase int:tolower
RewriteMap error-map dbm:/var/www/errormap.map
RewriteRule ^/error.html ${error-map:${lowercase:%{REQUEST_URI}}|/test/notfound.html} [R,NC,L]

The %{REQUEST_URI} doesn't seem to work. If I hardcode /demo.html there, the lookup works. What do I miss? Loading a module? Using a different variable? Dark magic indeed.

By: NameMike

NameMike — Tue, 17 Jul 2012 19:50:18 +0000

Hi Ralph, thanks for publishing this!

I was hoping to see in this list the last-modified date of the requested file, but I don't see it here. Is there any way to pull this information into .htaccess?

Mike

By: NameOliver

NameOliver — Wed, 20 Jun 2012 13:06:12 +0000

Still haven't got a ******* clue. Is there an idiots guide somewhere?

By: Sabine

Sabine — Thu, 29 Dec 2011 13:57:30 +0000

Where can I donate? This article is the missing link of all mod_rewrite so called documentation. Thank you so much!

By: Adam KopeÄ‡

Adam KopeÄ‡ — Wed, 24 Aug 2011 09:33:19 +0000

Bookmarked. Forever.

Big thanks, man.

By: Brad Neuberg

Brad Neuberg — Wed, 10 Aug 2011 00:14:58 +0000

Note that for some reason the original error status trick wasn't working for me if I followed it with an [L]; I had to use [PT] to pass the request back through. Here's an example of my code to return a 409 when certain headers are present:

ErrorDocument 409 /error_file_conflict.json
Redirect 409 /trigger-error/409
RewriteCond %{REQUEST_URI} ^/files/([^/]+)/trunk/head/.*$
RewriteCond %{REQUEST_METHOD} ^PUT$
RewriteCond %{HTTP:X-Subversion-Revision} !283
Header set X-Subversion-Revision 283
RewriteRule ^.*$ /trigger-error/409 [PT]

Notice the [PT] at the very end. Here's an example cURL request that now correctly works with this:

curl http://api-local.inkling.com/files/ganongs_physiology_23e/trunk/head/s9ml/chapter04/ch04_1_testfigure_4-4.s9ml -i -H "Content-Type: text/xml" -H "X-Subversion-Revision: 282" -X PUT

It took me forever to find this, so posting in case it helps other people :)

Best, Brad Neuberg

By: Greg

Greg — Wed, 06 Jul 2011 20:06:28 +0000

So I have an interesting situation. I have two webservers running as virtual hosts. Site1 and Site2 - they both run on the same set of hardware and both use the same IP address. When someone comes into Site2/site.gateway.html$ I need them to proxy to Site1/site.gateway.html$1.

RewriteCond %{REQUEST_URI} ^/site.gateway.html$
RewriteRule ^(.*)$ http://Site1$1 [NE,P]

Throws an error of:

Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. X-Forwarded-Host: site1, site1, site1 ...

The thing is, I have to have "ProxyPreserveHost On" because of other mod_proxy directives. Any ideas? I am thrown on this one.

By: Pelle

Pelle — Wed, 29 Jun 2011 15:07:54 +0000

Cheers,

thanks for the awesome insights on mod_rewrite. Found this article while searching for information about the IS_SUBREQ variable. Still I couldn't find out, when exactly this variable is set to true. Could you maybe enlighten me?

Thanks a lot, Pelle.

By: Abdelkarim

Abdelkarim — Wed, 04 May 2011 06:49:43 +0000

I'm lost. In my problem need to change the variables SERVER_NAME and HTTP_POST, because these variables Akamai gives me the name of the original machine. With these valuesâ€‹â€‹, the Joomla rewrite, I change the URL for these values. I tried:

SERVER_ADDR SetEnvIf 192  .168  .74  .142 SERVER_NAME = i.like.this.name.com
 
RewriteRule .* - [E = SERVER_NAME "i.like.this.name.com, NE]
 
RequestHeader set SERVER_NAME "i.like.this.name.com"

In this case if I create a variable, HTTP_SERVER_NAME but not changing the value of SERVER_NAME No positive result.