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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.