feat(iroh-net): Send HTTP/1.1 HOST header on requests to relay

[matheus23]

Description

Reverse proxies that map multiple virtual hosts need some help to know where to forward requests to.
That's what the HOST header is for, and it's mandatory for HTTP/1.1 requests.

Closes #2870

Change checklist

• Self-review.
• [ ] Documentation updates following the style guide, if relevant.
• Tests if relevant.
• [ ] All breaking changes documented.

[matheus23]

@link2xt please try out this PR and let us know if it helps ✌️

[github-actions]

Documentation for this PR has been generated and is available at: https://n0-computer.github.io/iroh/pr/2881/docs/iroh/

Last updated: 2024-11-04T08:32:35Z

[link2xt]

Reverse proxies need some help to know where to forward requests to.

That's a bit strange explanation. I already know at my reverse proxy where I want to forward requests, it's just that Host header is required by HTTP/1.1 standard and nginx is strict about enforcing it.

[github-actions]

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Last updated for commit: 5340b50

[matheus23]

I can see that reading strange to you. I adjusted the PR description to hopefully clarify.
Not all proxies need this HOST header to help them. Only the ones that map multiple virtual hosts.
And if I'm reading the history here correctly, they added mandatory support for HOST headers to make all client applications send them by default, so any virtual-host-mapping proxies out there just work.

[link2xt]

Tested, can connect to the relay over nginx proxy now.