Railway•13mo ago

How to host websockets?

This is my first time hosting socket server, how can i do that on railway? I docs there are only webhooks which are a unknown field for me, my app uses socket.io is it possible to host that here? project-id: 9ca93930-ec44-4d40-81ae-5a2f6b7c6928

Solution:

look at this example code from socket.io https://socket.io/docs/v4/server-initialization/#with-express but just replace the 3000 with the port constant from this code example https://docs.railway.app/troubleshoot/fixing-common-errors#node--express...

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23 Replies

Percy•13mo ago

Project ID: N/A

Medim•13mo ago

Yeah, SocketIO works fine U just have to be careful with this

Brody•13mo ago

says you

Medim•13mo ago

https://help.railway.app/troubleshooting/hKqw9Dr1moxfDySTy98E6G/websocket-connections-disconnecting/sb6bfjV6UnuMwkRyAvQ3Sb

Railway | Help Center

WebSocket Connections Disconnecting – Railway | Help Center

Steps to take to make sure that WebSockets are behaving as expected on the platform.

Medim•13mo ago

skill issue

Brody•13mo ago

pretty sure thats been fixed long ago, unless me and fp where talking about something else

BIROALTACC•13mo ago

"Users who want websocket support should use custom domains for now. The root cause of the disconnects is to an issue with how envoy is handling our wildcard domains. "

Brody•13mo ago

but regardless, it is still a very good idea to send ping/pongs and socket.io does this by default

BIROALTACC•13mo ago

I won't buy domain, what is my other option?

Brody•13mo ago

uh no you didnt read it, websockets are still very much possible with a railway domain please do not jump to conclusions like that and if websockets are possible socket.io is too, your socket.io server will need to listen on the railway provided PORT variable

Solution

Brody•13mo ago

Medim•13mo ago

And if you are using expressjs, the SocketIo instance needs to be started together with the expressjs server in your code example:

var http = require("http");
var server = http.createServer(app);

const io = require("socket.io")(server, {
  cors: {
    origin: "*",
    methods: ["GET", "POST"],
  },
});

var http = require("http");
var server = http.createServer(app);

const io = require("socket.io")(server, {
  cors: {
    origin: "*",
    methods: ["GET", "POST"],
  },
});

BIROALTACC•13mo ago

I'm trying this now, but one thing I don't understand how can my websocket listen on the same port as my express, this is how my code looks like now ------------------------------------------ const port = process.env.PORT || 3000; app.listen(port, "0.0.0.0"); const httpServer = createServer(app); httpServer.listen(port); const io = new Server(httpServer, { cors: { credentials: true, origin: ["http://localhost:3000"], }, }); ------------------------------------------

Brody•13mo ago

BIROALTACC•13mo ago

I see, yes

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How to host websockets?