[appendix]
== Migrating from Gun 1.2 to 1.3

Gun 1.3 improves the support for CONNECT requests
introduced in the previous version and documents
Websocket protocol negotiation.

=== Features added

* The `protocols` CONNECT destination option has been added
  as a replacement for the now deprecated `protocol` option.

* Add built-in support for Websocket protocol negotiation
  through the Websocket option `protocols`. The interface
  of the handler module currently remains undocumented and
  must be set to `gun_ws_h`.

* Add the h2specd HTTP/2 test suite from the h2spec project.

=== Bugs fixed

* Fix connecting to HTTP/2 over TLS origin servers via
  HTTP/1.1 CONNECT proxies.

* Do not send the HTTP/1.1 keepalive while waiting for
  a response to a CONNECT request.

* Do not crash on HTTP/2 HEADERS frames with the
  PRIORITY flag set.

* Do not crash on HTTP/2 HEADERS frames when the
  END_HEADERS flag is not set.

* Do not crash on unknown HTTP/2 frame types.

* Reject HTTP/2 WINDOW_UPDATE frames when they would
  cause the window to overflow.

* Send a GOAWAY frame on closing the HTTP/2 connection.