Для апача
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<ifModule mod_rewrite.c> RewriteEngine On RewriteCond %{HTTP_ACCEPT} image/webp RewriteCond %{REQUEST_URI} (?i)(.*)(\.jpe?g|\.png)$ RewriteCond %{DOCUMENT_ROOT}%1.webp -f RewriteRule (?i)(.*)(\.jpe?g|\.png)$ %1\.webp [L,T=image/webp,R] </IfModule> <IfModule mod_headers.c> Header append Vary Accept env=REDIRECT_accept </IfModule> AddType image/webp .webp |