Can we provided a way to keep the original header name case.

[IWANABETHATGUY]

  let mut headers = request.headers_mut();

  headers. append(
      "Host",
      HeaderValue::from_static("report-worker-2.noscription.org"),
  );

  headers.insert("User-Agent", HeaderValue::from_str("Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36").unwrap());

dbg!(&header);

this code print:

[src/main.rs:41] &request.headers() = {
 
    "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36"
}

Some servers require the header name is case-sensitive, which may cause some server internal errors.

[daniel-abramov]

This sounds like an issue that is very similar (if not same) to snapview/tungstenite-rs#287

It's a bit complicated since that's how the underlying headers library behaved as far as I can recall. We'd need to find a workaround (essentially a kludge) if we want to make it work.