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    <p>For serving WebP images, I use a rewrite rule in nginx that checks for the existence of the file and support for WebP images. I ported it over to Apache mod_rewrite since the OP mentioned mod_negotiation. The rewrite looks for a User Agent containing the word "chrome" and than checks for a file with a .webp extension with the same name and path as the .jpg or the .png file and if so serves the WebP file. The rewrite rule is a bit kludgy but it gets the job done. </p> <pre><code>AddType image/webp .webp # strip the extension off of all JPGs RewriteCond %{HTTP_USER_AGENT} (chrome) [NC] RewriteRule (.*)\.jpg$ $1 #check for a webp file, if so serve it RewriteCond %{REQUEST_FILENAME}.webp -f RewriteRule (.*) $1.webp [E=WEBP:1] #check for if we did not have a webp file and we do have a jpg, if so serve it RewriteCond %{REQUEST_FILENAME}.jpg -f RewriteCond %{REQUEST_FILENAME}.webp !-f RewriteRule (.*) $1.jpg # strip the extension off of all PNGs RewriteCond %{HTTP_USER_AGENT} (chrome) [NC] RewriteRule (.*)\.png$ $1 #check for a webp file, if so serve it RewriteCond %{REQUEST_FILENAME}.webp -f RewriteRule (.*) $1.webp [E=WEBP:1] #check for if we did not have a webp file and we do have a png, if so serve it RewriteCond %{REQUEST_FILENAME}.png -f RewriteCond %{REQUEST_FILENAME}.webp !-f RewriteRule (.*) $1.png </code></pre> <p>For my site, I have the luxury of being able to load my photos in via JavaScript after I can detect the support for WebP in the browser instead of relying on the user agent string. If WebP support exists than I set a cookie before I begin loading in my images. Therefore instead of this RewriteCond </p> <pre><code>RewriteCond %{HTTP_USER_AGENT} (chrome) [NC] </code></pre> <p>I would use this</p> <pre><code>RewriteCond %{HTTP_COOKIE} supports_webp </code></pre>
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    1. POUsing mod_negotiation to serve webp if the UA requests it
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    1. COAny chance I can see what that looks like in the nginx version? I just tried unporting these rules, curious what yours looks like.
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      1. USDandre Allison
    2. COGreat unless you're using a reverse proxy, in which case Varying based on User-Agent will hurt your cache-hit rate. Chrome now sends "image/webp" in the Accept header for image requests, so that'd be a better thing to check for.
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