Erlang Cowboy, Server Side Event, eventsource close and reconnects about every 60 seconds

0
votes

I have the cowboy example eventsource running on a local Debian server. For the code please see --> https://github.com/ninenines/cowboy/tree/master/examples/eventsource

After about 60 seconds there is always a 'eventsource was closed' then a 'eventsource connected' message.

I am testing on the latest chrome browser on win10.

I cannot see any reason for this and I wondered if this something built into the SSE standard, that the connection is dropped at regular intervals.

The chrome debugger shows the following error message: GET http://192.168.1.100:8080/eventsource net::ERR_INCOMPLETE_CHUNKED_ENCODING 200 (OK)

Any thoughts?

MPC

1
erlangcowboy

1 Answers

2
votes

You're most likely hitting the idle timeout.

You can change it with the following snippet in the cowboy example:

    {ok, _} = cowboy:start_clear(http, [{port, 8080}], #{
        idle_timeout => 15000,
        env => #{dispatch => Dispatch}
    }),

You have more information about ProtocolOpts in the cowboy doc