Add the Accept-Post header in the OPTIONS response according to latest WHIP draft:
The WHIP endpoint MUST support OPTIONS requests for Cross-Origin Resource Sharing (CORS) as defined in [FETCH] and it SHOULD include an "Accept-Post" header with a mime type value of "application/sdp" on the "200 OK" response to any OPTIONS request recevied as per [W3C.REC-ldp-20150226].
Add the Accept-Post header in the OPTIONS response according to latest WHIP draft:
The WHIP endpoint MUST support OPTIONS requests for Cross-Origin Resource Sharing (CORS) as defined in [FETCH] and it SHOULD include an "Accept-Post" header with a mime type value of "application/sdp" on the "200 OK" response to any OPTIONS request recevied as per [W3C.REC-ldp-20150226].