From 5e05fe8e7877ffd6bc473b77b8ca0a12ad26bd67 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Thu, 14 Mar 2024 16:23:56 +0100
Subject: Cowboy 2.12, Cowlib 2.13, Gun 2.1

---
 docs/en/gun/2.1/guide/migrating_from_1.2.asciidoc | 39 +++++++++++++++++++++++
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 create mode 100644 docs/en/gun/2.1/guide/migrating_from_1.2.asciidoc

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diff --git a/docs/en/gun/2.1/guide/migrating_from_1.2.asciidoc b/docs/en/gun/2.1/guide/migrating_from_1.2.asciidoc
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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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