fanout/pushpin

Hi @jkarneges. I'm using nginx as a proxy in front of pushpin. I'm using ws over http for websocket requests and I'm proxying non ws requests over HTTP2 to a static site and Kong API gateway. Nginx is closing the ws connection after 60 seconds - which is as per its default proxy timeout settings. I want to keep the connection open and changing this to another value works in prolonging the connection duration but ultimately defers the issue. The ideal solution is to use the PushPin keep-alive but I can't seem to get this working. This is an extract of the code I'm using. I'm subscribing to the channel on the OPEN event and adding the keep alive header. I'm adding a header for the keep alive as I wasn't sure from the documentation as it's not long polling or pure websockets.

 // An open event is sent on its own to establish the connection

``` if (inEvents[0].getType() == 'OPEN') { log.info(InEvents OPEN:, script);

    //  check for channel header otherwise generate one
    let channel = req.params.channel

    if (!channel){
        channel = uuidv1();
    }

    log.info(`Publish channel: ${channel}`, script);

    var outEvents = setGripEvents(inEvents[0].getType(),channel);

    // set channel header on the response
    res.setHeader('Set-Meta-Channel', channel);
    res.setHeader('Sec-WebSocket-Extensions', 'grip; message-prefix=""');                        
    res.setHeader('Content-Type', 'application/websocket-events');    
    // added timeout to stop socket from being closed
    res.setHeader('Grip-Keep-Alive','\\n; format=cstring; timeout=30');
    log.debug(`response headers: ${JSON.stringify(res.getHeaders())}`);

    // send response
    res.writeHead(200);
    res.end(grip.encodeWebSocketEvents(outEvents));
}

Any advice would be gratefully received.