serves a .webp image instead of jpg/png

.htaccess

<IfModule mod_rewrite.c>
  RewriteEngine On

  # serves a .webp image instead of jpg/png
  RewriteCond %{HTTP_ACCEPT} image/webp
  RewriteCond %{REQUEST_FILENAME} ^(.+)\.(jpe?g|png)$
  RewriteCond %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