iroh-net does not send the Host: header to the relay

[link2xt]

I am trying to put iroh-relay behind nginx: chatmail/server#445
Current problem is that nginx rejects the requests from iroh-net 0.25.0 with error 400.
According to the logs nginx gets GET /relay HTTP/1.1, then header upgrade: iroh derp http, then rejects because client sent HTTP/1.1 request without "Host" header.
I cannot make it proxy the request to iroh-relay.

HTTP/1.1 requires the Host: header and it seems to be impossible to make nginx proxy requests that don't have one.

I will try to upgrade iroh-net and see if it resolves the problem. EDIT: upgraded to 0.26.0 so far, and the problem remained. Trying to upgrade to 0.27.0, but it has its own problems: deltachat/deltachat-core-rust#6133

[link2xt]

It seems this part of code missies .header(HOST, ...):

iroh/iroh-net/src/relay/client.rs

Lines 719 to 722 in f0590be

	let req = Request::builder()
	.uri(RELAY_PATH)
	.header(UPGRADE, Protocol::Relay.upgrade_header())
	.body(http_body_util::Empty::<hyper::body::Bytes>::new())?;

The value should be self.url.host_str().

As described in https://docs.rs/hyper/1.5.0/hyper/header/constant.HOST.html "A Host header field must be sent in all HTTP/1.1 request messages. A 400 (Bad Request) status code will be sent to any HTTP/1.1 request message that lacks a Host header field or contains more than one.".