README.http2: mention some alt-svc thoughts

diff --git a/lib/README.http2 b/lib/README.http2
index 0a397523dc5e6a595f887a73ed3337e787fa5c9d..3e9ba206497a3e36ea3be89a2b0eaf7e3bd9087d 100644 (file)
--- a/lib/README.http2
+++ b/lib/README.http2
@@ -50,6 +50,16 @@ SSL libs
     NSS:     ALPN and NPN
     GnuTLS:  ALPN
 
+Alt-Svc
+
+  Alt-Svc is a suggested new header with a corresponding frame (ALTSVC) in
+  http2 that tells the client about an alternative "route" to the same content
+  for the same origin server that you get the response from. A browser or
+  long-living client can use that hint to create a new connection
+  asynchronously.  For libcurl, we may introduce a way to bring such clues to
+  the applicaton and/or let a subsequent request use the alternate route
+  automatically.
+
 Applications
 
   We hide http2's binary nature and convert received http2 traffic to headers