Client.Describe sends request with OPTIONS method, not DESCRIBE

[SwiftExtender]

I have code snippet like

`
url, err := base.ParseURL(rawURL)
if err != nil {
s.term.Errorf("Url parsing %q failed: %v", rawURL, err)
return false
}

client := gortsplib.Client{
	Scheme: url.Scheme,
	Host:   url.Host,
}

err = client.Start()
if err != nil {
	s.term.Errorf("Perform failed for %q (auth %d): %v", url, stream.AuthenticationType, err)
	return false
}
client.Describe()
_, rc, err := client.Describe(url)

`

And i see in wireshark than app sends request with OPTIONS method, not DESCRIBE. Why? Server first response returns in response "Public: OPTIONS, DESCRIBE, ANNOUNCE, SETUP, PLAY, RECORD, PAUSE, TEARDOWN, SET_PARAMETER, GET_PARAMETER\r\n"

I am using latest library version (v5)

[aler9]

Hello, as you can see by looking at the code, the Client always send a OPTIONS request before any other request in order to assess the server capabilities, in particular whether the server supports GET_PARAMETER, which is used as keepalive. If you are calling Describe(), The DESCRIBE request is correctly sent just after the OPTIONS one.

Code is here:

gortsplib/client.go

Lines 1179 to 1184 in b6f80fd

	if !c.optionsSent && req.Method != base.Options {
	_, err := c.doOptions(req.URL)
	if err != nil {
	return nil, err
	}
	}

and here:

gortsplib/client.go

Lines 1368 to 1369 in b6f80fd

	c.optionsSent = true
	c.useGetParameter = supportsGetParameter(res.Header)