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[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.
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