[erlang-questions] Mochiwebsockets was Re: Long polling

Loïc Hoguin <>
Fri Jul 20 00:46:56 CEST 2012

Just Cowboy.

Mochicow is plugged on top of Cowboy and replaces Mochiweb entirely.

You don't need a "socket server", whatever that is, you can just use 
websockets directly in Cowboy, or if you need a long polling fallback 
there's Bullet available, which is just a library of one module + one js 
file really. Either way they don't try to anticipate your needs, they 
just transport data.

On 07/20/2012 12:42 AM, Gordon Guthrie wrote:
> Loïc
> So I would then have 3 things running my application - mochiweb,
> cowboy and a socket server...
> I am a big fan of avoiding code at all costs :(
> Given that I have a simple understood use case, mebbies I don't need a
> fully featured socket server, mebbies I need to put a simple
> client-driven registration system...
> Gordon
> On 19 July 2012 23:24, Loïc Hoguin <> wrote:
>> Or you can replace Mochiweb by Cowboy+Mochicow
>> (https://github.com/benoitc/mochicow) and use Cowboy's routing to redirect
>> to your websocket handler or your mochiweb code.
>> On 07/19/2012 11:02 PM, Gordon Guthrie wrote:
>>> Gleb
>>> The app is built on mochiweb - I inspect the request and route it to a
>>> handler. So I would need to bind the server part of the library to the
>>> that particular HTTP request.
>>> Bullet is designed to work in Cowboy,
>>> Socket.io has its own Erlang server
>>> SockJS is designed to be web-framework agnostic but the examples are
>>> all in Cowboy
>>> As I understand it - these socket solutions have a code the server
>>> side and client side which ping traffic backwards and forwards and
>>> keep a 'permanent' connection open - and the higher level libraries
>>> can then write to the socket as if there was a stateful synchronous
>>> connection.
>>> So to use one of these I would need to pick a particular client JS
>>> library and then write my own handler to use on the socket in mochiweb
>>> (or cut one out from one of the existing servers...)
>>> Has anyone done stuff on getting it into mochiweb?
>>> Gordon
>>> On 17 July 2012 16:01, Gleb Peregud <> wrote:
>>>> On Tue, Jul 17, 2012 at 4:57 PM, Gordon Guthrie <> wrote:
>>>>> Folks
>>>>> I am building a softphone which needs to register with the server to say
>>>>> "I
>>>>> am available" for incoming calls.
>>>>> So it makes an HTTP POST request to the server and that notifies the
>>>>> softphone gen_srv that is is available.
>>>>> At that point I leave the TCP request hanging on a receive waiting for a
>>>>> notification that the socket has been torn down (and which point it
>>>>> unregisters the phone).
>>>>> My question is: how long can I leave the request up? Infinity? or do I
>>>>> need
>>>>> to have a timeout/reregister cycle setup?
>>>> You have to cycle it. Some proxies timeout connections after 30
>>>> seconds, some after 45 some after 60. It is very tricky to get it
>>>> right for all browsers and all platforms. Generally if you want a
>>>> robust solution use something like SockJS or Socket.IO or Bullet.
>>> _______________________________________________
>>> erlang-questions mailing list
>>> http://erlang.org/mailman/listinfo/erlang-questions
>> --
>> Loďc Hoguin
>> Erlang Cowboy
>> Nine Nines
>> http://ninenines.eu

Loïc Hoguin
Erlang Cowboy
Nine Nines

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