probe - draft-ietf-httpbis-http2-encryption-06.txt

|   A client can also explicitly probe for an alternative service
|   advertisement by sending a request that bears little or no sensitive
|   information, such as one with the OPTIONS method.  Likewise, clients
|   with existing alternative services information could make such a
|   request before they expire, in order minimize the delays that might
|   be incurred.

Side note:

I think that

GET /.well-known/http-opportunistic HTTP/1.1

works even better than OPTIONS for probe. If this gives 
Alt-Svc: header then there is no even need to lookup for 
http-opportunistic  -resource.

/ Kari Hurtta

Received on Tuesday, 28 June 2016 08:24:03 UTC