//ps-proxy server(192.168.0.1,...) 
//pp-proxy server ip(3128,...)
//proxyuser-user name
//proxypass-password


http0.ProxyParams.BasicAuthentication:=false;
http0.ProxyParams.ProxyUsername:='';
http0.ProxyParams.ProxyPassword:='';
if proxy then
	begin
			http0.ProxyParams.ProxyServer:=ps;
			http0.ProxyParams.ProxyPort:=pp;
			if proxyuser<>'' then
					http0.ProxyParams.BasicAuthentication:=true;
			http0.ProxyParams.ProxyUsername:=proxyuser;
			http0.ProxyParams.ProxyPassword:=proxypass;
	end;