What I Learned Building a Real-Time Chat App With WebSockets in Go

As developers, we often reach for the usual suspects — REST APIs, GraphQL, or third-party services — even when our app requirements lean toward real-time communication. A few months ago, I needed to build a simple chat server that updates instantly without polling, so I decided to explore WebSockets using Go (Golang).

In this post I’ll walk through:

What WebSockets are

How they differ from REST

A minimal Go implementation

What problems you might run into along the way

🔁 Why WebSockets?

Most HTTP-based APIs (including REST) are request/response — meaning the client asks, then the server replies. That works for many use cases, but not for:

Chat apps

Live dashboards

Real-time games

Collaborative tools

WebSockets, on the other hand, allow persistent bidirectional communication between client and server without repeated polling.

🚀 WebSockets in Go — Example Code

Here’s a basic WebSocket handler using the popular gorilla/websocket package:

package main

import (
"github.com/gorilla/websocket"
"net/http"
)

var upgrader = websocket.Upgrader{}

func wsHandler(w http.ResponseWriter, r *http.Request) {
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
http.Error(w, "Could not upgrade", http.StatusBadRequest)
return
}
defer conn.Close()

for {
    // Read message from browser
    messageType, p, err := conn.ReadMessage()
    if err != nil {
        break
    }

    // Print and send back
    fmt.Printf("Received: %s\n", p)
    conn.WriteMessage(messageType, p)
}

}

func main() {
http.HandleFunc("/ws", wsHandler)
http.ListenAndServe(":8080", nil)
}

This simple server:

Upgrades an HTTP request to a WebSocket connection

Reads messages

Echoes them back to the client

Of course, you’ll want to expand this for:

Broadcasting to multiple users

Room/channel support

Better error handling

💡 Deployment Tips

Here are a few gotchas to watch out for:

Proxy & Load Balancer Support: Ensure your reverse proxy supports WebSockets (e.g., NGINX with proxy_http_version 1.1 and appropriate headers).

CORS Restrictions: If you’re calling from a browser, make sure your CORS settings allow WebSocket connections.

Heartbeat/Ping-Pong: Use ping/pong frames to prevent idle clients from being disconnected.

🧠 Final Thoughts

Using WebSockets in Go is a rewarding way to understand real-time protocols without the overhead of third-party services. You get:

✔ Better responsiveness
✔ Simpler architecture for interactive apps
✔ More efficient use of server resources

If you’re just starting with real-time apps, I’d encourage you to build a small prototype like this — it teaches a lot about the fundamentals.

Got questions or enhancements? Let me know in the comments!

🔖 Tags

golang #websockets #webdev #tutorial

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