set status to 101 (switching protocols)

Author: SteffenDE

lib/plug/conn.ex

@@ -1471,7 +1471,7 @@ defmodule Plug.Conn do
   @spec upgrade_adapter(t, atom, term) :: t
   def upgrade_adapter(%Conn{adapter: {adapter, payload}, state: state} = conn, protocol, args)
       when state in @unsent do
-    conn = run_before_send(conn, :set_upgrade)
+    conn = run_before_send(%{conn | status: 101}, :set_upgrade)
 
     case adapter.upgrade(payload, protocol, args) do
       {:ok, payload} ->

test/plug/conn_test.exs

@@ -512,6 +512,7 @@ defmodule Plug.ConnTest do
       conn(:get, "/foo")
       |> register_before_send(fn conn ->
         send(self(), {:state, conn.state})
+        assert conn.status == 101
 
         conn
         |> put_resp_header("x-test", "UPGRADE")