Nginx rewrite config for colored favicons, based on subdomain. If you have your dev. codebase, staging/qa. codebase, and your prod. codebase on the same server, you can give them different favicons to differentiate between the different branches. All subdomains that start with dev (such as dev.example.com and dev.app.example.com) would get the r…

favicon-colors

location ~* /favicon(.*) {
    log_not_found off;
    access_log off;
    root /var/www/default;
}
location = /favicon.ico {
    if ($host ~* ^dev\.) {
        rewrite ^/favicon\.ico$ /favicon-red.ico last;
    }
    if ($host ~* ^qa\.) {
        rewrite ^/favicon\.ico$ /favicon-green.ico last;
    }
}