WebP support with fallback for all browsers

.htaccess

AddType image/webp webp

<IfModule mod_rewrite.c>
	RewriteEngine On

	RewriteCond %{HTTP_USER_AGENT} Chrome [OR]
	RewriteCond %{HTTP_ACCEPT} image/webp
	RewriteCond %{REQUEST_URI} ^(.+)\.(gif|jpe?g|png)$ [NC]
	RewriteRule . %1.webp [T=image/webp,E=accept:1]

	RewriteCond %{HTTP_USER_AGENT} !Chrome
	RewriteCond %{HTTP_ACCEPT} !image/webp
	RewriteCond %{REQUEST_URI} ^(.+)\.webp$ [NC]

	RewriteCond %{DOCUMENT_ROOT}/%1.png -f
	RewriteRule . %1.png

	RewriteCond %{DOCUMENT_ROOT}/%1.jpg -f
	RewriteRule . %1.jpg

	RewriteCond %{DOCUMENT_ROOT}/%1.jpeg -f
	RewriteRule . %1.jpeg

	RewriteCond %{DOCUMENT_ROOT}/%1.gif -f
	RewriteRule . %1.gif
</IfModule>

<IfModule mod_headers.c>
	Header append Vary Accept env=REDIRECT_accept
</IfModule>