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Posts tagged #ServerSentEvents

Sohardh Chobera

1 week ago

If you’ve ever wondered how to push real-time updates from server to client without turning your backend into a polling mess… this one’s for you.

Read the full post here: sohardh.com/blog-post/serv…

#ServerSentEvents #SSE #realtime

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3 months ago

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Everything You Need to Know to Master Server-Sent Events (SSE) in Symfony 7.4 I often see teams reach for WebSockets (via Socket.io or Pusher) when they simply need to update a UI with server-side state changes. While WebSockets are powerful, they are often overkill. If your...

Everything You Need to Know to Master Server-Sent Events (SSE) in Symfony 7.4 #Technology #SoftwareEngineering #WebDevelopment #Symfony #ServerSentEvents

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@goadesign.bsky.social

10 months ago

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GitHub - goadesign/goa: Design-first Go framework that generates API code, documentation, and clients. Define once in an elegant DSL, deploy as HTTP and gRPC services with zero drift between code and ... Design-first Go framework that generates API code, documentation, and clients. Define once in an elegant DSL, deploy as HTTP and gRPC services with zero drift between code and docs. - goadesign/goa

The branch feat/sse now contains a complete initial implementation. Give it a shot and report any issue in GitHub! github.com/goadesign/goa

#GoaDev #GoLang #ServerSentEvents #OpenSource #APIDesign

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@senoritadeveloper.bsky.social

11 months ago

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Detect “Back to Online” Status in Angular Detect When the Browser is Back Online and Multicast Events

Detect ‘Back to Online’ Status in Angular - Detect When the Browser is Back Online and Multicast Events #angular #serversentevents #polyfill #online #browserevents senoritadeveloper.medium.com/detect-back-...

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@dev.to.web.brid.gy

11 months ago

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Server-Sent Events (SSE) 🖧🌐 ## 🖧 What is Server-Sent Events (SSE)? Imagine you are watching **live cricket scores** on a website. The scores update **automatically** , without you refreshing the page. 💡 This happens because the **server** keeps sending new scores to your browser and the browser updates the page. **This is exactly what SSE does.** SSE is a way for the **server to push updates** to the browser **without** the browser asking for them repeatedly. ## ➡️ When Should You Use SSE? SSE is great for cases where **real-time updates** are needed, such as: Use Case | Example ---|--- 🔥 Live Scores | Cricket, Football, or Stock Updates 🗞️ News Feeds | Breaking News Websites 💬 Chat Apps | Messages Coming in Real-Time 📊 Live Dashboards | Monitoring System Data 🚀 **Key Feature** : The page updates **without refreshing!** ## ➡️ How SSE Works? 1️⃣ The **server** keeps sending updates. 2️⃣ The **browser (webpage)** listens and updates automatically. 3️⃣ Uses a single **connection** , reducing server load compared to frequent AJAX requests. > 💡 **Think of SSE as a radio station** 🎙️ broadcasting news, and your browser is the radio 📻 listening to updates! ## ➡️ Let’s Create a Simple SSE Example ### 😎 What Will We Build? A webpage that **shows live time updates from the server** every 2 seconds. ☑ No page refresh needed! ☑ Lightweight & easy to use! ## 👩🏽‍💻 Step 1: Create the Backend (Server) We will use **Node.js** to create a simple server that sends time updates. ### 📝 Create a file **server.js** and add this code: const http = require("http"); // Import built-in HTTP module http.createServer((req, res) => { if (req.url === "/events") { // Check if the request is for SSE res.writeHead(200, { "Content-Type": "text/event-stream", "Cache-Control": "no-cache", "Connection": "keep-alive" }); setInterval(() => { const time = new Date().toLocaleTimeString(); res.write(`data: ${time}\n\n`); // Send updated time to the client }, 2000); } }).listen(3000, () => console.log("Server running on port 3000")); ### 📌 Explanation: * `http.createServer()` creates a simple server. * If the user visits **`/events`** , the server **sends real-time updates**. * `setInterval()` sends the current time **every 2 seconds**. * `res.write()` sends the time update to the browser. * The server runs on **port 3000**. > **🛠️ Run the Server:** > > 1. Open the terminal (Command Prompt). > 2. Navigate to the folder where **server.js** is saved. > 3. Run: `node server.js` > 4. You should see **"Server running on port 3000"** 🎉 > ## 👩🏽‍💻 Step 2: Create the Frontend (HTML Page) Now, we need a webpage to **receive and display** the live time updates. ### 📝 Create a file **index.html** and add this code: <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Live Time Updates</title> </head> <body> <h1>Live Time from Server</h1> <p id="time">Waiting for updates...</p> <script> // Connect to the server using SSE const eventSource = new EventSource("http://localhost:3000/events"); // When a new message (update) arrives, update the webpage eventSource.onmessage = (event) => { document.getElementById("time").innerText = event.data; }; </script> </body> </html> ### 📌 Explanation: * `new EventSource("http://localhost:3000/events")` **connects to the server** and listens for updates. * Whenever the server **sends a new time** , `onmessage` updates the page. * **No refresh needed!** ## 👩🏽‍💻 Final Step: Run the Project ❶ Start the server: `node server.js` ❷ Open **index.html** in a browser ❸ See the **live time updating every 2 seconds!** ## ➡️ Why Use SSE Instead of Other Methods? Feature | Server-Sent Events (SSE) | WebSockets | AJAX Polling ---|---|---|--- 📡 Connection Type | One-way (Server ➡️ Browser) | Two-way | Multiple Requests 🔄 Auto Updates | ✅ Yes | ✅ Yes | ❌ No ⚡ Performance | ✅ Efficient | ⚡ Best | ❌ High Load 🔗 Complexity | ✅ Simple | ❌ Complex | ⚠️ Medium 🔹 **Use SSE** when you need **one-way live updates** (like news, stock prices). 🔹 **Use WebSockets** when you need **two-way communication** (like chat apps). 🔹 **Avoid AJAX polling** for frequent updates as it **wastes resources!** ## ➡️ Important Points 1. SSE lets a server send **automatic updates** to a browser. 2. It’s **easy to use** with just JavaScript (No extra libraries needed!). 3. Great for **live updates** (news, dashboards, sports scores). 4. Uses **less bandwidth** compared to AJAX polling. 5. **Works in most browsers** , except older versions of Internet Explorer. ## ➡️ Next Steps ↪ Try modifying the server to **send random jokes instead of time!** ↪ Experiment with **multiple clients** (open `index.html` in different tabs). ↪ Learn about **WebSockets** for **two-way communication**. ### **🙌 Hope you found this helpful! 🤗**

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