Adding WebP support for NGiNX

This is a very short snippet post so you need to have knowledge about how to configure and customize your NGiNX setup since this is a quick mashup of the config required.

Install WebP.

sudo apt-get install webp

In http {} add the following:

map $http_accept $webp_suffix {
  default   "";
  "~*webp"  ".webp";
}

This mapping checks whether the browser client supports WebP images, when it does it will set WebP image files as default source.

In location / {} under the server {} add the following:

location ~* ^.+\.(jpe?g|png) {
  add_header Cache-Control "public, no-transform";
  add_header Vary "Accept-Encoding";
  try_files $uri$webp_suffix $uri =404;
  expires max;
}

For all jpg, jpeg or png images it will load the WebP variant of it if available, only if the browser client supports it.

I use the following script to convert all jpg, jpeg and png images to WebP while keeping the original in place for browser clients that doesn’t support WebP.

echo "===== Converting images into WebP .webp ====="
for x in `find /var/www/itchy -type f \( -iname \*.jpeg -o -iname \*.jpg -o -iname \*.JPG -o -iname \*.png \)`
  do cwebp -quiet -q 80 ${x} -o ${x}.webp;
  echo "Converted $x to ${x}.webp"
done

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