Nginx CORS proxy

gistfile1.txt

map $sent_http_access_control_allow_origin $cors {
    default   "";
    ""        "*";
}

location ~* /proxy/(?<pschema>https?):/(?<phost>[\w.]+)(?<puri>\/.*)    {
    set $adr $pschema://$phost;
    rewrite .* $puri break;
    resolver 8.8.8.8;
    proxy_pass $adr;

    add_header 'Access-Control-Allow-Origin' $cors;
    add_header 'Access-Control-Allow-Methods' 'GET,OPTIONS';
    
    proxy_set_header Host $phost;

    proxy_ssl_server_name on;

    proxy_redirect off;
    proxy_connect_timeout 1;
    expires 30;

    recursive_error_pages on;
    proxy_intercept_errors on;
    error_page 301 302 307 = @handle_redirects;
}

location @handle_redirects {
    resolver 8.8.8.8;
    set $saved_redirect_location '$upstream_http_location';

    add_header 'Access-Control-Allow-Origin' $cors;
    add_header 'Access-Control-Allow-Methods' 'GET,OPTIONS';
    
    proxy_pass $saved_redirect_location;
}