How does hyper serialize a Request into bytes and then send it to the server over a TCP connection?

[shawn-li-zh]

I can't find a clue in the code

[dswij]

If you're looking for the internals of hyper, most of it is in https://github.com/hyperium/hyper/tree/master/src/proto.

for HTTP/2, hyper also uses the h2 crate. See https://github.com/hyperium/h2