CODEWITHSUNDEEP
regex.htaccess
ddinchev
ddinchev

Reputation: 34673

Redirect subdomain requests that do not end with image extension to main domain (htaccess)

I have a sub domain that I intend to use for CDN at some point: images.example.com. The requests on that subdomain should look like http://images.example.com/path/to/some/image.jpg. But currently everything is still hosted on the same server, and the server is configured to have images.example.com as alias for example.com.

This way both requests will work: http://images.example.com/path/to/some/image.jpg http://example.com/path/to/some/image.jpg

But also other valid request will resolve on both subdomain and tld: http://example.com/blog/post/Some-Interesting-Non-Image-Content http://images.example.com/blog/post/Some-Interesting-Non-Image-Content

Let's assume that if an image is streamed, the URL will have image extension. I want to write a rewrite Cond/Rule for .htaccess that will redirect all requests on images.example.com, that do not end in image extension (\.gif|\.png|\.jpeg|\.jpg) to example.com. Also I'd like to have the opposite rule. If a request with (\.gif|\.png|\.jpeg|\.jpg) comes to example.com - redirect it to images.example.com.

I tried several things, they seem to fail (I have trouble working out .htaccess regular expressions):

RewriteCond %{HTTP_HOST} ^images\.example\.com (.*) (?!\.jpg|\.gif|\.jpg|\.jpeg)$
RewriteRule ^(.*) http://www.example.com/$1 [R=301,L]

RewriteCond %{HTTP_HOST} ^example\.com (.*) (\.jpg|\.gif|\.jpg|\.jpeg)$
RewriteRule ^(.*) http://images.example.com/$1 [R=301,L]

Upvotes: 2

Views: 270

Answers (1)

Jon Lin
Jon Lin

Reputation: 143856

The %{HTTP_HOST} variable contains only the hostname, as it is transmitted in the HTTP "Host" request header. Therefore, you can't attempt to match things like the request URI in it. You can do that in either the regex pattern in the RewriteRule or against the %{REQUEST_URI} variable. Try:

RewriteEngine On

RewriteCond %{HTTP_HOST} ^images\.example\.com$ [NC]
RewriteRule !\.(jpe?g|gif|ico|png)$ http://www.example.com%{REQUEST_URI} [R=301,L,NC]

RewriteCond %{HTTP_HOST} ^(www\.)?example\.com$ [NC]
RewriteRule \.(jpe?g|gif|ico|png)$ http://images.example.com%{REQUEST_URI} [R=301,L,NC]

The NC flag is to indicate the match to be case insensitive.

Upvotes: 1

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