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Apache: Detecting WebP support with Header Vary Accept
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| <IfModule mod_rewrite.c> | |
| RewriteEngine On | |
| RewriteCond %{HTTP_ACCEPT} image/webp | |
| RewriteCond %{DOCUMENT_ROOT}/$1.webp -f | |
| RewriteRule (.+)\.(jpe?g|png)$ $1.webp [T=image/webp,E=accept:1] | |
| </IfModule> | |
| <IfModule mod_headers.c> | |
| Header append Vary Accept env=REDIRECT_accept | |
| </IfModule> | |
| AddType image/webp .webp |
What exactly is this code supposed to do?
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@MusikDK, you probably see a .png files because that's what the URL in the page points to. But the server is serving an webp image "disguised" as a file with extension .png. It's an internal rewrite.