🧠 Problem Recap: Why Short Polling Isn’t Enough

In Short Polling, the client keeps asking:

“Hey server, do you have any new messages?”

every few seconds (like every 3s).

⚠️ Most of the time, the server says “No”, wasting:

• Network bandwidth
• Server CPU
• Database I/O (if it checks DB each time)

So we need something smarter that doesn’t spam the server — but still reacts instantly when something new happens.

⚡ What is Long Polling?

Long Polling = “Ask once and wait until something happens.”

Instead of sending requests repeatedly every few seconds,

the client sends one request — and the server holds it open until it has new data (or times out).

Let’s visualize:

🔁 Flow

1. Client → Server: “Any new messages?”
2. Server → waits (doesn’t reply yet).
3. As soon as new message arrives → Server responds immediately.