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SSE > WebSockets

How to Implement Real-Time Notifications Without WebSockets

WebSockets are overkill for notifications. Server-Sent Events deliver the same real-time experience with less code, lower cost, and zero proxy headaches. Notilayer handles the SSE connection for you.

Start Free — No WebSockets Needed See the Comparison

Head-to-Head

SSE vs WebSockets for Notifications

Notifications only flow in one direction — server to client. SSE was designed for exactly this pattern.

Criteria Server-Sent Events WebSockets
Latency Sub-second Sub-second
Setup complexity Low High
Proxy / CDN compatibility Works everywhere Often blocked
Browser support All modern browsers All modern browsers
Data direction Server → Client Bidirectional
Auto-reconnect Built-in Manual
Server cost Lower Higher
Best for notifications? Yes Overkill

WebSockets shine for chat and multiplayer games. For notifications, SSE is the right tool.

Architecture

How Notilayer Uses SSE Under the Hood

You send an API call. Notilayer streams the notification to the user's browser. The widget renders it. Three steps, zero WebSocket servers.

1

Your Backend Sends a POST

Call the Notilayer REST API with a userId, title, and body. Standard HTTP from any language or framework.

2

Notilayer Streams via SSE

The notification is pushed to the user's browser through a persistent SSE connection managed entirely by Notilayer's infrastructure.

3

Widget Updates Instantly

The bell badge increments and the notification appears in the inbox drawer. No page refresh. No polling. Sub-second delivery.

Zero Boilerplate

No Custom EventSource Code Required

With raw SSE you write connection logic, reconnection handlers, and message parsers. With Notilayer, you write two lines on the frontend and one API call on the backend.

Frontend

Widget handles SSE automatically

// 1. Add the widget script to your HTML
<script src="https://api.notilayer.com/widget/widget.js"></script>

// 2. Initialize — SSE connection is handled automatically
Notilayer.init({
  projectId: 'your-project-id',
  userId:    'current-user-id'
});

// That is it. No EventSource. No onmessage handler.
// Notifications appear in the bell widget in real-time.
Backend

Send via REST API

// Send a notification from your backend
const res = await fetch('https://api.notilayer.com/v1/notify', {
  method: 'POST',
  headers: {
    'Authorization': `Bearer ${process.env.NOTILAYER_API_KEY}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    userId: 'user_123',
    title: 'New comment on your post',
    body: 'Sarah replied to "Getting Started".',
  }),
});

// Notilayer delivers via SSE — no WebSocket server needed

What you skip by using Notilayer

  • No new EventSource() setup
  • No onmessage / onerror handlers
  • No reconnection logic or heartbeat management
  • No SSE server infrastructure to deploy and scale

FAQ

Real-time notification questions

What is the difference between SSE and WebSockets for notifications?
Server-Sent Events (SSE) use a simple HTTP connection for one-way server-to-client streaming, which is ideal for notifications. WebSockets provide bidirectional communication but add complexity — you need to manage connection upgrades, heartbeats, reconnection logic, and many proxies and load balancers require special configuration. For notifications that only flow from server to client, SSE is simpler, cheaper, and more reliable.
Do I need to write EventSource code to use Notilayer?
No. Notilayer's widget script handles the entire SSE connection internally. You add one script tag, call Notilayer.init() with your project and user ID, and the widget manages connection setup, reconnection, and rendering. You never touch the EventSource API directly.
Does SSE work behind corporate proxies and CDNs?
Yes. SSE runs over standard HTTP/HTTPS, so it passes through virtually all proxies, CDNs, and firewalls without special configuration. WebSockets require an HTTP Upgrade handshake that many corporate proxies block or misconfigure. This makes SSE significantly more reliable in enterprise environments.
What browsers support Server-Sent Events?
All modern browsers support SSE natively — Chrome, Firefox, Safari, Edge, and Opera. The EventSource API has been available for over a decade. The only exception was Internet Explorer, which is now end-of-life. Notilayer's widget includes a lightweight polyfill for any edge cases.

Explore more: Home · Node.js Integration · React Notification Bell

Real-Time Notifications Without the WebSocket Headache

Add a notification bell with SSE delivery in under 10 minutes. Free plan included.

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