Feature suggestion for trillium: Lifetimes of Headers::get should be more flexible

[divergentdave]

In a function that takes &Conn, I tried passing a String to conn.request_headers().get(...), and I got a lifetime error. This method's signature is pub fn get<'a>(&'a self, name: impl Into<HeaderName<'a>>) -> Option<&'a HeaderValue>. The string implements Into<HeaderName<'static>>, but of course the lifetime of the connection reference is not 'static. I was able to fix my error by writing conn.request_headers().get(string.as_str()) instead. I think the method signature should be changed to pub fn get<'a, 'b>(&'a self, name: impl Into<HeaderName<'b>>) -> Option<&'a HeaderValue> if possible, since the name is not part of the returned value.

[jbr]

closed in #312, released as trillium-http@v0.2.14