the post also recommends that some http traffic is OK, but doesn't that directly contradict the advice to not mix tcp with udp (assuming that the http traffic sits on top of tcp)?
It's clarified in the next line.
> "The point is, don’t split your game protocol across UDP and TCP."
There is always going to be data transmitted other than the game protocol. Most likely that is going to be limited and not at the same time as real time data is being transmitted.
