Getting Bad Request

[cyantarek]

When emitting events from client, I got Bad Request

POST http://localhost:8500/socket.io/?EIO=3&transport=polling&t=1578039627529-2&sid=4 400 (Bad Request)

And on the server console, it said 'resume'

Here's my client code:

var socket = io();

var mesageForm = document.getElementById('send-container');
var mesageContainer = document.getElementById('message-container');
var mesageInput = document.getElementById('message-input');


const name = prompt('What is your name?');
appendMessage('You' + ' joined');

socket.emit('new-user', name);

socket.on('chat-message', data => {
    appendMessage(data)
});

socket.on('user-connected', name => {
    appendMessage(name + ' joined')
});

mesageForm.addEventListener('submit', function (e) {
    e.preventDefault();

    const message = mesageInput.value;
    socket.emit('send-chat-message', message);
    mesageInput.value = ''
});

function appendMessage(msg) {
    const messageElement = document.createElement('div');

    messageElement.innerText = msg;
    mesageContainer.append(messageElement)
}

And here's my server code

package main

import (
	socketio "github.com/googollee/go-socket.io"
	"github.com/labstack/echo"
)

type Sock struct {
	sock socketio.Conn
	Name string
}

var socks = make(map[string]Sock)

func main() {
	io, _ := socketio.NewServer(nil)
	
	app := echo.New()
	
	app.Static("/", ".")
	
	app.Any("/socket.io/", func(s echo.Context) error {
		io.ServeHTTP(s.Response().Writer, s.Request())
		
		return nil
	})
	
	io.OnConnect("/", func(s socketio.Conn) error {
		socks[s.ID()] = Sock{
			sock: s,
		}
		
		s.Emit("chat-message", "Server: Hello World")
		
		return nil
	})
	
	io.OnEvent("/", "new-user", func(s socketio.Conn, name string) {
		sk := socks[s.ID()]
		sk.Name = name
		
		for k, v := range socks {
			if k != s.ID() {
				v.sock.Emit("user-connected", name)
			}
		}
	})
	
	io.OnEvent("/", "send-chat-message", func(s socketio.Conn, msg string) {
		for k, v := range socks {
			if k != s.ID() {
				v.sock.Emit("chat-message", msg)
			}
		}
	})
	
	go io.Serve()
	defer io.Close()
	
	app.Start(":8500")
}

It's annoying. What is causing this error?

[erkie]

Is it because you are socket.emit('new-user', name); before the socket is actually connected? Try changing the emit to an .on('connect' callback.