Automati c Proxy pa c и в чем разница

Question

В чем разница между return proxyAll; И return proxySingle;

    function FindProxyForURL (url, host)
    {       
        var proxySingle =  "PROXY 1.2.2.1:80";
        var proxyAll =  "PROXY 1.2.2.1:80;PROXY 1.2.2.2:80;PROXY 1.2.2.3:80;PROXY 1.2.2.4:80;PROXY 1.2.2.5:80;"; 

        // difference between return proxyAll AND return proxySingle
        return proxyAll;  //    return proxySingle; 
    }