Support server-side requests

[BenLocal]

When I connect the camera, every 30 seconds, send OPTIONS request to keep alive, however, the camera will send response: RTSP/1.0 200 OK......

but camera also send a request： OPTIONS*RTSP/1.0.........

An error occurred while parsing this request in the code pkg\base\response.go line144

proto := string(byts[:len(byts)-1])   //  this proto value is "OPTIONS"

if proto != rtspProtocol10 {
	return fmt.Errorf("expected '%s', got '%s'", rtspProtocol10, proto)
}

logs: c->s OPTIONS rtsp://192.168.35.108/media.sdp/ RTSP/1.0 CSeq: 6 Session: 0 User-Agent: gortsplib

s>c RTSP/1.0 0

c->s TEARDOWN rtsp://192.168.35.108/media.sdp/ RTSP/1.0 CSeq: 7 Session: 0 User-Agent: gortsplib

s>c RTSP/1.0 0

I am using ffplay to play this camera stream and it is no problem, ffplay responds to this request:

[aler9]

Hello, this is related to #56 - at the moment the client library doesn't support cameras or servers that send requests back. It may in the future.

[aler9]

fixed by #378

[aler9]

added in MediaMTX v1.0.1

[github-actions[bot]]

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