I'm trying to match URLs of this type:
http://www.example.com/image/12345
I'd then like to check whether this file exists:
http://www.example.com/files/image_12345.jpg
If it does, I'd like to rewrite the URL to point to that file.
If it doesn't I'd like to rewrite the URL to point to my image-generating script:
http://www.example.com/img_gen.php?id=12345
Here's what I've got so far:
RewriteCond %{REQUEST_FILENAME} ^/image/([0-9]+)$
RewriteCond %{DOCUMENT_ROOT}/files/images_%1.jpg !-f
RewriteRule ^image/([0-9]+)$ img_gen.php?id=$1 [L]
RewriteCond %{REQUEST_FILENAME}\.html -f
RewriteRule ^image/([0-9]+)$ /files/images_$1.jpg [L]
But all I'm getting is a 404.