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Rails 5 ActionCable does not return update headers with status 101 Activate response

EDIT: At the end, it shows that update headers have been created.

I am working from action-cable-example codebase trying to create a WebSocket application. The Chatty application, which depends on the browser client provided in the application, works great. But I will not use this client as I need an external IoT connection. As a result, I try to implement WebSocket ws / wss protocols for external non-browsers, and my connection is in route.rb:

mount ActionCable.server => '/cable'

I tried several external clients, such as the Chrome Simple WebSocket client extension and gem websocket-client-simple using sample / client.rb. In both cases, the ActionCable does not return update headers. The Chrome extension complains as follows:

WebSocket connection to 'ws://127.0.0.1:3000/cable' failed: Error during WebSocket handshake: 'Upgrade' header is missing

The actual handshake shows that this is true, as in:

**General**
Request URL:ws://127.0.0.1:3000/cable
Request Method:GET
Status Code:101 Switching Protocols
**Response Headers**
view source
Connection:keep-alive
Server:thin
**Request Headers**
view source
Accept-Encoding:gzip, deflate, sdch
Accept-Language:en-US,en;q=0.8
Cache-Control:no-cache
Connection:Upgrade
Cookie:PPA_ID=<redacted>
DNT:1
Host:127.0.0.1:3000
Origin:chrome-extension://pfdhoblngboilpfeibdedpjgfnlcodoo
Pragma:no-cache
Sec-WebSocket-Extensions:permessage-deflate; client_max_window_bits
Sec-WebSocket-Key:1vokmzewcWf9e2RwMth0Lw==
Sec-WebSocket-Version:13
Upgrade:websocket
User-Agent:Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.84 Safari/537.36

According to the standards, the response headers should be:

HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: HSmrc0sMlYUkAGmm5OPpG2HaGWk=
Sec-WebSocket-Protocol: chat

Sec-WebSocket-Accept is especially important because it is computed based on the Sec-WebSocket-Key request header to confirm that ws / wss is understood and that there should be switching protocols.

During all this, the server is happier until the client marks and closes the connection:

Started GET "/cable" for 127.0.0.1 at 2016-06-16 19:19:17 -0400
  ActiveRecord::SchemaMigration Load (1.0ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Started GET "/cable/" [WebSocket] for 127.0.0.1 at 2016-06-16 19:19:17 -0400
Successfully upgraded to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: Upgrade, HTTP_UPGRADE: websocket)
Finished "/cable/" [WebSocket] for 127.0.0.1 at 2016-06-16 19:19:18 -0400

Looking at websocket-client-simple, I broke the WebSocket returned by client.rb and it also showed empty headers. I show the code and then WebSocket:

url = ARGV.shift || 'ws://localhost:3000/cable'
ws = WebSocket::Client::Simple.connect url

#<WebSocket::Client::Simple::Client:0x2cdaf68 
    @url="ws://localhost:3000/cable", 
    @socket=#<TCPSocket:fd 3>, 
    @handshake=<WebSocket::Handshake::Client:0x013231c8 
        @url="ws://localhost:3000/cable", 
        @headers={}, 
        @state=:new, 
        @handler=#<WebSocket::Handshake::Handler::Client11:0x2e88400 
            @handshake=<WebSocket::Handshake::Client:0x013231c8 
                @url="ws://localhost:3000/cable", 
                @headers={}, 
                @state=:new, 
                @handler=#<WebSocket::Handshake::Handler::Client11:0x2e88400 ...>, 
                @data="", 
                @secure=false, 
                @host="localhost", 
                @port=3000, 
                @path="/cable", 
                @query=nil, 
                @version=13>, 
            @key="KUJ0/C0rvoCMruW8STp0Sw==">, 
        @data="", 
        @secure=false, 
        @host="localhost", 
        @port=3000, 
        @path="/cable", 
        @query=nil, 
        @version=13>, 
    @handshaked=false, 
    @pipe_broken=false, 
    @closed=false, 
    @__events=[{:type=>:__close, :listener=>#<Proc:0x2d10ae8@D:/Bitnami/rubystack-2.2.5-3/projects/websocket-client-simple/lib/websocket-client-simple/client.rb:37>, :params=>{:once=>true}, :id=>0}], 
    @thread=#<Thread:0x2d10a70@D:/Bitnami/rubystack-2.2.5-3/projects/websocket-client-simple/lib/websocket-client-simple/client.rb:42 sleep>
>;

, "@handshaked" false. , , .

UPDATE: , WebSocket:: Driver.start . , @socket.write(response) EventMachine. :

def start
  return false unless @ready_state == 0
  response = handshake_response
  return false unless response
  @socket.write(response)
  open unless @stage == -1
  true
end

handshake_response:

HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: iJVnsG1ApNMFzABXGDSHN1V0i/s=
+4
1

, Thin- . . , , :

Response Headers
Connection:keep-alive
Server:thin

ActionCable , , Thin , .

Puma :

Response Headers
HTTP/1.1 101 Switching Protocols
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Accept: XJOmp1e2IwQIMk5n0JV/RZZSIhs=
+7

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