From 5b810c924da242632a04a2c44772cb892aa1b7c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Lo=C3=AFc=20Hoguin?= <essen@ninenines.eu>
Date: Sat, 2 Jun 2018 22:44:16 +0200
Subject: Revamp the manual, one page per function/message

---
 doc/src/manual/gun.ws_upgrade.asciidoc | 100 +++++++++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 doc/src/manual/gun.ws_upgrade.asciidoc

(limited to 'doc/src/manual/gun.ws_upgrade.asciidoc')

diff --git a/doc/src/manual/gun.ws_upgrade.asciidoc b/doc/src/manual/gun.ws_upgrade.asciidoc
new file mode 100644
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--- /dev/null
+++ b/doc/src/manual/gun.ws_upgrade.asciidoc
@@ -0,0 +1,100 @@
+= gun:ws_upgrade(3)
+
+== Name
+
+gun:ws_upgrade - Upgrade to Websocket
+
+== Description
+
+[source,erlang]
+----
+ws_upgrade(ConnPid, Path)
+    -> ws_upgrade(ConnPid, Path, [])
+
+ws_upgrade(ConnPid, Path, Headers)
+    -> StreamRef
+
+ws_upgrade(ConnPid, Path, Headers, WsOpts)
+    -> StreamRef
+
+ConnPid   :: pid()
+Path      :: iodata()
+Headers   :: [{binary(), iodata()}]
+WsOpts    :: gun:ws_opts
+StreamRef :: reference()
+----
+
+Upgrade to Websocket.
+
+The behavior of this function depends on the protocol
+selected.
+
+HTTP/1.1 cannot handle Websocket and HTTP requests
+concurrently. The upgrade, if successful, will result
+in the complete takeover of the connection. Any
+subsequent HTTP requests will be rejected.
+
+Gun does not currently support Websocket over HTTP/2.
+
+By default Gun will take the Websocket options from
+the connection's `ws_opts`.
+
+== Arguments
+
+ConnPid::
+
+The pid of the Gun connection process.
+
+Path::
+
+Path to the resource.
+
+Headers::
+
+Additional request headers.
+
+WsOpts::
+
+Configuration for the Websocket protocol.
+
+== Return value
+
+A reference that identifies the newly created stream is
+returned. It is this reference that must be passed in
+subsequent calls and will be received in messages related
+to this new stream.
+
+== Changelog
+
+* *1.0*: Function introduced.
+
+== Examples
+
+.Upgrade to Websocket
+[source,erlang]
+----
+StreamRef = gun:ws_upgrade(ConnPid, "/ws", [
+    {<<"sec-websocket-protocol">>, <<"chat">>}
+]).
+receive
+    {gun_upgrade, ConnPid, StreamRef, [<<"websocket">>], _} ->
+        ok
+after 5000 ->
+    error(timeout)
+end.
+----
+
+.Upgrade to Websocket with different options
+[source,erlang]
+----
+StreamRef = gun:ws_upgrade(ConnPid, "/ws", [], #{
+    compress => false
+}).
+----
+
+== See also
+
+link:man:gun(3)[gun(3)],
+link:man:gun:ws_send(3)[gun:ws_send(3)],
+link:man:gun_upgrade(3)[gun_upgrade(3)],
+link:man:gun_ws(3)[gun_ws(3)]
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