DuckDuckGo nginx config for handling Safari search bar requests

nginx.conf

    server {
        server_name search.yahoo.com;

        # only handle requests from Safari search bar
        if ($args ~ fr=aaplw.*p=) {
            rewrite ^/search https://duckduckgo.com/?q=$arg_p? break;
        }

        # attempt to redirect other requests back to Yahoo, using alternative server name
        rewrite ^ http://search.ystg1.b.yahoo.com$request_uri? break;
    }

    server {
        server_name www.google.com;

        # only handle requests from Safari search bar
        if ($args ~ client=safari.*q=) {
            rewrite ^/search https://duckduckgo.com/?q=$arg_q? break;
        }

        # redirect other requests to info page explaining what happened
        rewrite ^ http://help.duckduckgo.com/customer/portal/articles/255678? break;
    }

    server {
        server_name www.bing.com;

        # only handle requests from Safari search bar
        if ($args ~ q=.*form=APMCS1) {
            rewrite ^/search https://duckduckgo.com/?q=$arg_q? break;
        }

        # redirect other requests to info page explaining what happened
        rewrite ^ http://help.duckduckgo.com/customer/portal/articles/255682? break;
    }