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I implemented an image generator which saves the final file in .jpg format inside /images. Once the file is saved, there is no need to generate it ever again.

This is the route for the image generator:

/gen.php?id=495abc

This is the directory where all the .jpg images are saved:

/images/495abc.jpg

So, the objective is: If a user tries to request http://website.com/images/495abc.jpg, the .htaccess rules have to verify if the file exists and then execute one of two actions depending on the case:

  1. if the .jpg exists, serve the file directly.

  2. if the .jpg does not exist, redirect the request to the generator at /gen.php?id=495abc (the new image will be displayed at the end of this process with Header("Content-Type: image/jpeg"))

Is that feasible via .htaccess? If not, there is another alternative: Redirect all /images/*.jpg requests to /gen.php?id=* and let gen.php do all the dirty work. Of course, the first alternative is better.

Any ideas? Thanks!

Andres SK
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1 Answers1

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Yes. It is possible with htaccess:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^images/(\d+)\.(jpe?g|png|gif|ico|bmp)$ /gen.php?id=$1 [L,NC]
hjpotter92
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  • I was trying your solution and it was not working and I just realized why. The ID is not necessarily a digit only, it can contain alphanumeric characters (md5 values). What should the **d** value be in that case? – Andres SK Nov 15 '14 at 19:21