Fix CookieNeverExpires time, set an option for -1 for browser-based session (when browser closes cookie is removed)

http.go

@@ -343,14 +343,15 @@ func (s *Server) FullHost() string {
 
 // Hostname returns the hostname part of the host (host expect port)
 func (s *Server) Hostname() string {
-	idxPort := strings.IndexByte(s.Host(), ':')
+	a := s.Host()
+	idxPort := strings.IndexByte(a, ':')
 	if idxPort > 0 {
 		// port exists, (it always exists for Config.ListeningAddr
-		return s.Host()[0:idxPort] // except the port
+		return a[0:idxPort] // except the port
 	} // but for Config.VListeningAddr the developer maybe doesn't uses the host:port format
 
 	// so, if no port found, then return the Host as it is, it should be something 'mydomain.com'
-	return s.Host()
+	return a
 }
 
 func (s *Server) listen() error {