How to get response header?

Hi,
I'm using this crate as websocket client, I want to know how to get response header?
My code like below,

let ws_client = ClientBuild:new(...)...;
let (mut ws_read, mut ws_write) = ws_client.split.unwrap();

// write loop
std::thread::spawn(move || {
    loop {
        ws_write.send_message(...);
    }
});

// read loop
std::thread::spawn(move || {
    for message in ws_read.incomming_messages() {
        // I want to get response header here.
         ...
    }
});

Or how to get response header in handshaking?

Start by tracing the client handshake and the ClientBuild, split, and incoming_messages APIs shown in the issue. Determine where the handshake response is represented and whether its headers remain accessible after splitting; done means the supported access path is identified or the required API/documentation scope is defined.