Skip to content

Commit c4299a1

Browse files
misterwilliambradfitz
misterwilliam
authored and
bradfitz
committedJul 29, 2018
http2/h2c: add h2c implementation (unencrypted HTTP/2)
Implements h2c by leveraging the existing http2.Server by implementing the 2 ways to start an h2c connection as described in RFC 7540, which are: (1) create a connection starting with HTTP/1 and then upgrading to h2c [Section 3.2] and (2) starting a connection directly speaking h2c (aka starting with prior knowledge) [Section 3.4]. For both of the above connection methods the implementation strategy is to hijack a HTTP/1 connection, perform the h2c connection on the hijacked net.Conn, and create a suitably configured net.Conn to pass into http2.Server.ServeConn. For h2c with prior knowledge this is relatively simple. For that we just have to verify the HTTP/2 client preface has been written to the net.Conn, and then reforward the client preface to the hijacked connection. For h2c upgraded from HTTP/1, this is a bit more involved. First we validate the HTTP/1 Upgrade request, and respond to the client with 101 Switching Protocols. Then we write a HTTP/2 client preface on behalf of the client, and a settings frame and a headers frame which correspond to what was in the upgrade request. Then since http2.Server is going respond with a settings ACK, we swallow it so that it is not forwarded to the client since for h2c upgrade from HTTP/1 the 101 Switching Protocols response replaces the settins ACK. Fixes golang/go#14141 Change-Id: I435f40216c883809c0dcb75426c9c59e2ea31182 Reviewed-on: https://go-review.googlesource.com/112999 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
·
v0.41.0v0.1.0
1 parent 3673e40 commit c4299a1

File tree

2 files changed

+550
-0
lines changed

2 files changed

+550
-0
lines changed
 

0 commit comments

Comments
 (0)
Please sign in to comment.