HTTP vs WebSocket Explained: Which Protocol is Best for Real-Time Communication?

HTTP vs WebSocket

• HTTP:

  • Operates on the transport layer.
  • Creates a TCP connection for each request, then closes it after completion (non-persistent).
  • Ideal for standard request-response models but not for real-time updates.

• WebSocket:

• Establishes a persistent connection between the browser and the server.
• Allows the server to push data to the client without needing client-side requests.
• Useful for real-time applications like chat systems, multiplayer games, and live data feeds.

Key Concepts

1. WebSocket Connection Process:

   • Initiates with an HTTP request, then "upgrades" to a WebSocket connection.
   • Persistent connection enables continuous data exchange.

2. Real-Time Use Cases:

   • Example: Binance Live Prices:

     • Uses a WebSocket connection to receive updates about price changes, chart updates, etc., directly from the server.
     • Messages are streamed in real-time, avoiding frequent HTTP requests.

   • Chat Applications:

     • Server pushes messages to clients as events.

   • Multiplayer Games:

     • Server sends updates like player locations, actions, etc., using WebSocket or WebRTC.

WebSocket vs WebRTC

• WebSocket:

  • Utilizes TCP, ensuring reliable message delivery (all events are received).
  • Ideal for applications requiring complete data integrity.

• WebRTC:

  • Utilizes UDP, allowing some data loss for faster communication.
  • Suitable for scenarios like multiplayer games where missing minor updates is acceptable.