Import some HTTP tests

[timschumi]

I have been writing behavior tests for HTTP while testing CHTTP, figured I might as well clean them up and import the tests that apply to both.

Draft until I figure out where I can start and kill the testing HTTP server.

[sarahsturgeon]

Haven't read yet, but thank you!

We can host test pages on a subdomain on gluatest.com?

[timschumi]

We can host test pages on a subdomain on gluatest.com?

I'm worried that putting any kind of additional layer in between (reverse proxy, Cloudflare, etc.) or switching to another language (e.g. PHP) may break the sometimes very-intentionally-broken test cases.

Additionally, having this as a locally runnable Python script is probably the best we can get for developer experience, we just need to figure out where to place the following in the CI setup:

"${GITHUB_WORKSPACE}/gmod_tests/lua/tests/gmod/unit/globals/HTTP.py" 1>/dev/null 2>&1 &
until curl --silent "http://127.0.0.1:5000" 1>/dev/null 2>&1; do sleep 1; done

[do the gluatest things]

kill $!

Also, thinking about it, probably a good idea to disable the tests (instead of letting them fail) if the HTTP server isn't running.

[timschumi]

Figured out launching the server, killing it is optional at this point in time.

Now why does HTTP always fall back to unsuccessful?

EDIT: How much will explode if I just --net=host this?

[timschumi]

Could I get some workflow approval for this?

[timschumi]

The x86-64 failure we also get on main, so I suppose this is merge-ready now? Codifying the differences for dedicated servers I will submit in another PR down the line.

[timschumi]

Bump? :^)

[RaphaelIT7]

iirc like 9 months ago when @sarahsturgeon thought of HTTP tests we'd concluded to include the HttpServer module from HolyLib into HolyTest to be used for that purpose.
I think it would be better if that were used instead of Python, as shipping yet more external things needed when the HolyTest DLL exists for that purpose already seems pointless & just more complex.
From looking at the Python code, I think most of it should all work, though the echo_method may be an issue as it won't support TRACE & CONNECT