The Apache module mod_rewrite provides a rule-based rewriting engine that is used by most MVC frameworks (i.e. CakePHP and Zend Framework) and content management solutions (i.e. Drupal and WordPress.)
The benefits of using a rewrite engine include:
- Making website URLs more memorable to users
- Making website URLs more relevant to search engines
- Masking the inner workings of the site by hiding file extensions
I ran into an issue the other day where I needed to run a legacy application that was being protected by basic .htaccess authentication. The legacy application was located in a subdirectory.
Typically, you would just add the following line of code to your .htaccess file to instruct the rewrite engine to ignore the directory:
RewriteEngine off
Unfortunately, this won't work as expected. For basic authentication, the server writes a "401 Unauthorized" header and then looks for an error document based on a pre-defined path. Most of the time, the error document won't exist in the directory that you want to protect, so the request gets handled by the rewrite engine which throws a 404 error.
The solution to this problem is pretty straightforward. You need to add a single line of code to your .htaccess file instructing Apache to ignore the error document. When you're done, the code should look something like this:
ErrorDocument 401 "Unauthorized Access"
RewriteEngine off
AuthType Basic
AuthName "Administration"
require valid-user
AuthUserFile "/home/user/.htpasswds/public_html/admin/passwd"
Hopefully this will save somebody a bit of aggravation.
NickC on December 8, 2009 at 3:19 pm
Thank you....
voiture thermique on April 6, 2010 at 10:34 pm
Hey, thank you for this info i'm on the precess of getting a new domain. Thanks again.
Trent on July 19, 2010 at 6:17 am
Life saver! I was beginning to think I'd never get to the bottom of this conflict, I just couldn't make sense of it... Thanks!
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Kaylene on November 17, 2011 at 6:52 pm
Your post was a life saver. My server was returning Error 404 with nothing helpful in the error_log when I tried to enable basic authentication in a protected directory. I spent days researching and trying to figure out what was happening. Your solution worked, and the legacy software is now up an running. Thank you again!
