Share tcp port between axum and tcp server

[AeonSolstice]

Summary

Is there any way to have normal tcp connections and an axum http server on the same port? I know it is possible to make your own listener, accept clients, then forward to axum to handle the requests, but is there a way to detect if the tcp connection is an http request? Maybe there is a method that attempts to handle a tcp connection but returns an error along with the socket/stream + any read data indicating that the connection was not an http request?

axum version

=0.8.1

[mladedav]

If I understand the question correctly, you want to run an application on one port and handle the connection with axum if it's HTTP and somehow else if it is not? If so, I really think you don't want to do that, just use two different ports for the two different services. You might also want to look if a reverse proxy like nginx cannot do things like that if you need to use only one port because of firewall or something.

If you really need to do it, you might try implementing your own Listener which saves any data and use something like in the example of serve-with-hyper and if hyper errors out you can call the other service.

Or if your other protocol cannot contain arbitrary data from the start, you can just buffer the first 4 bytes to make sure they are HTTP and based on that your Listener implementation can either yield the connection to axum in accept or it can just pass it somewhere else.

[AeonSolstice]

That is indeed what I want to do, and I did think about checking the initial data. I could change the protocol for my other services to send a magic header but I think I will just use 2 ports as that sounds much more sane to implement (not sure why I did not think of that before). Thank you!