RE: Handling 404 errors

["Richard Peacock" <richard.peacock@xxxxxxxxxxxxxxx>]

Firstly, sorry for the top post … according to Apache.org :-

 

“'-F' (is existing file, via subrequest)
Checks whether or not TestString is a valid file, accessible via all the server's currently-configured access controls for that path. This uses an internal subrequest to do the check, so use it with care - it can impact your server's performance!”

 

(http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html)

 

This warning is related to the “F” flag and not “f” as Tom mentioned; surely if there was a performance issue with “f”, it would be documented as it is for “F”.

 

I would say that performance-wise, Tom’s suggestion would be the best (compared to my random hack suggestion anyway!).

Richard.

 

 

---

From: Andrew Hole [mailto:andremailinglist@xxxxxxxxx]
Sent: 26 August 2009 15:24
To: users@xxxxxxxxxxxxxxxx
Subject: Re: Handling 404 errors

 

Your solutions looks very useful, but i'm afraid about impact on server performance.

Do you have any idea about the impact on performance?

Thanks a lot

On Wed, Aug 26, 2009 at 2:59 PM, Tom Evans <tevans.uk@googlemail.com> wrote:

On Wed, 2009-08-26 at 12:23 +0100, Andrew Hole wrote:
> Hi guys!
>
> Actually our web application has a retry mechanism based on http
> status code returned to client. Just an example:
> - An http request is made to http://web/software_A_folder/file.swf
> - if the file doesn't exist (http 404) on software_A_folder, the
> request is made in core folder: http://web/core/file.swf
>
> This mechanism is used on entire application: when a file doesn't
> exist on software_x_folder, a retry is made on core folder.
>
> In terms of Apache, this mechanism make always 2 requests (in case of
> file not found).
>
> What I want to know is if there are any option on Apache to handle 404
> status code without retry the request. When file not found, some logic
> will handle the 404 and return the file located on other folder.
>
> I appreciate your help.
>
> Best Regards,
> A.

This looks like a simple rewrite rule surely?

       RewriteEngine On
       RewriteCond %{REQUEST_FILENAME} !-f
       RewriteCond %{REQUEST_URI} ^/software_A_folder/(.*)
       RewriteCond %{DOCUMENT_ROOT}/core/%1 -f
       RewriteRule ^/software_A_folder/(.*) /core/$1 [L]

Cheers

Tom

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