为什么我的高山linux docker应用程序不允许直接连接到套接字？

Question

我正在按照本教程创建docker / socket.io / aws应用程序。完全按照本教程操作，该应用程序即可正常工作。但是，如果我尝试从自托管客户端外部访问套接字，则只能使用http连接到服务器，但是如果我有Android应用程序或iOS应用程序尝试直接连接到套接字，它将永远无法完成握手？

我的猜测是Alpine Linux有某种反向代理问题？我是否需要设置一些nginx.conf或其他允许TCP直接连接到端口8080的东西？

DOCKERFILE：

FROM mhart/alpine-node:0.10.48 AS build
WORKDIR /srv
ADD package.json .
RUN npm install --prod
ADD . .

FROM mhart/alpine-node:base-0.10.48
COPY --from=build /srv .
EXPOSE 8080
CMD ["node", "server.js"] 

SOCKET SERVER：

if (typeof String.prototype.startsWith != 'function') {
  String.prototype.startsWith = function (str){
    return this.slice(0, str.length) == str;
  };
}

function log_me(msg){
  var ts = new Date(new Date().getTime() - (3600000*4));
  var tss = ts.toString();
  tss = tss.substring(0, tss.indexOf(' GMT'));
  console.log(tss + ": " + msg);
}

var io = require('socket.io').listen(8080,'0.0.0.0');
io.set('log level', 2);
io.set('transports', ['flashsocket', 'polling', 'websocket']);
io.set('origins', '*:*');

var socket = io.connect('http://0.0.0.0:8080');

io.sockets.on('connection', function (socket) {
  socket.on('join_channel', function(channel){
    log_me("join_channel: " + channel);
    socket.channel = channel;
    socket.join(channel);
  });
  socket.on('alert_ambulance', function(channel, data){
    log_me("alert_ambulance: " + channel + " - " + data);
    io.sockets.in(channel).emit('alert', data);
  });
  socket.on('call_ambulance', function(channel, data){
    log_me("call_ambulance: " + channel + " - " + data);
    io.sockets.in(channel).emit('call', data);
  });
  socket.on('proceed', function(channel, data){
    log_me("proceed: " + channel + " - " + data);
    io.sockets.in(channel).emit('proceed', data);
  });
  socket.on('instruct', function(channel, data){
    log_me("instruct: " + channel + " - " + data);
    io.sockets.in(channel).emit('instruct', data);
  });
  socket.on('status_update', function(channel, data){
    log_me("status_update: " + channel + " - " + data);
    io.sockets.in(channel).emit('status_update', data);
  });
  socket.on('ambulance_move', function(channel, data){
    io.sockets.in(channel).emit('ambulance_move', data);
  });
  socket.on('notify_cad', function(channel, data){
    log_me("notify_cad: " + channel + " - " + data);
    io.sockets.in(channel).emit('notify_cad', data);
  });
  socket.on('video_call_response', function(data){
    var obj = JSON.parse(data);
    log_me("video_call_response: " + obj.channel + " - " + data);
    io.sockets.in(obj.channel).emit('video_call_response', data);
  });
  socket.on('video_call_hangup', function(data){
    var obj = JSON.parse(data);
    log_me("video_call_hangup: " + obj.channel + " - " + data);
    io.sockets.in(obj.channel).emit('video_call_hangup', data);
  });
  socket.on('request_video_call', function(data){
    var obj = JSON.parse(data);
    log_me("request_video_call: " + obj.channel + " - " + data);
    io.sockets.in(obj.channel).emit('request_video_call', data);
  });
  socket.on('disconnect', function(){
    log_me("disconnect: " + socket.channel);
    if(socket.channel){
      if(socket.channel.startsWith("a_")){
        var c = socket.channel.replace("a_", "");
        var data = {'ambulance_id' : c, 'status' : 'DISCONNECTED'}
        io.sockets.in(c).emit('status_update', JSON.stringify(data));
      }
    }
    socket.leave(socket.channel);
  });
});

socket.io服务器可以正常工作，就像您可以使用http://blah.com:8080来访问服务器一样，但是浏览器之外试图直接连接到套接字的任何操作都将失败。