Fix DELETE URL problem

[neilyoung]

This PR addresses a problem with DELETE (missing FQDN, discussed here #3177) and fixes some CORS issues, which prevented this client to operate properly in trickle-ICE mode https://github.com/Eyevinn/whip

[aler9]

I tested both Eyevinn/whip client (https://web.whip.eyevinn.technology/) and OBS 30.1.2, against MediaMTX v1.6.0 and MediaMTX.

All combination worked without changing any header. Changes in this PR are not needed.

[neilyoung]

I'm sorry, we must be talking about different versions.

I'm here at commit f5d9fde of your repo, Aril 1st.

This is the response given to OBS 30.1.2 on MacOS for a DELETE with the URL, which is (still) relative and by that not working for OBS (and others):

The location header given in the 201 was:

whip/0ab307c5-870d-4eab-8cba-037a0d97d7a3

DELETE /whip/0ab307c5-870d-4eab-8cba-037a0d97d7a3 HTTP/1.1
Host: ai.votix.com:8889
Accept: */*
User-Agent: Mozilla/5.0 (OBS-Studio/30.1.2; Mac OS X; en-US)

HTTP/1.1 404 Not Found
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: *
Content-Type: text/plain
Server: mediamtx
Date: Sat, 13 Apr 2024 11:11:05 GMT
Content-Length: 18

404 page not found

It would work if it would be '/stream/whip/0ab307c5-870d-4eab-8cba-037a0d97d7a3'

What am I missing? You could have changed that meanwhile, that would explain it. I didn't pull for a while...

[neilyoung]

I tested both Eyevinn/whip client (https://web.whip.eyevinn.technology/)

I had a lengthy chat with Eyevinn last week regarding missing CORS headers, but feel free to ignore. I'm not using their solution.

Eyevinn/whip#133

[github-actions]

This issue is mentioned in release v1.7.0 🚀
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