is it possible to create "if" rule with rewrite action inside custom 404
location?
the task is fallback to jpg if upstream returns 404 for .webp request.
i've double-checked regexp's - they seems to be write....



location ~* \.(jpg|mp4|svg|jpeg|gif|png|css|bmp|js|swf|webp|jp2|ico)$ {

etag on;

proxy_cache site;

proxy_cache_valid 404 302 1m;

expires max;

proxy_cache_valid 2h;

proxy_pass http://cdn;

proxy_intercept_errors on;

proxy_connect_timeout 5s;

proxy_next_upstream error timeout http_404 http_403 http_500
http_502 http_503 http_504;

error_page 404 /webp.html;

}


location = /webp.html {

if ($request_filename ~* ^.+.webp$) {

rewrite ^/(.*)\.webp$ /$1.jpg redirect;

}

root /var/www/;

}
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