Lesson 6.10. Client-Server Interaction and Script Loading
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🚀 Client-Server Interaction: From HTTP to WebSocket and Script Loading Optimization
In this video, we'll cover the main methods of interaction between the client (browser) and the server, and also discuss how to properly include JavaScript for maximum performance.
🔄 1. Synchronous Interaction
📖 Description: The classic method, in which each new page loads completely.
🌐 Example: [topfood.club](https://topfood.club/reczeptyi/pervyi...) – when you navigate between pages, you'll see a full reload.
⚙️ How it works:
The browser sends an HTTP request to the server.
The server returns a new HTML page.
The browser reloads the page.
⚡ 2. Asynchronous Interaction (SPA)
📖 Description: The page is updated without reloading. Used in Single Page Applications (SPA).
🌐 Example: [yoric.ru](https://yoric.ru) – content is updated dynamically.
⚙️ How it works:
A single HTML page and JavaScript are loaded.
Data is loaded via an API (e.g., Fetch or Axios).
Content is updated without reloading the page.
✅ Advantages of SPA:
Smooth operation.
Fast response.
Separation of frontend and backend.
❌ Disadvantages of SPA:
Difficulties with SEO.
Slow initial load.
🌐 3. WebSocket
📖 Description: A protocol for real-time data exchange.
🎮 Use cases:
Chat applications.
Online games.
Real-time notifications.
✅ Advantages:
Low latency.
Efficiency for real-time applications.
📜 JavaScript Loading Features
🛠️ Async and defer attributes:
async: The script is loaded asynchronously and executed immediately after loading.
defer: The script is executed only after the HTML has fully loaded.
📌 When to use:
async: For analytics, advertising scripts.
defer: For DOM-dependent scripts.
🔗 Useful links:
[WebSocket documentation on MDN](https://developer.mozilla.org/ru/docs...)
[HTTP Overview on MDN](https://developer.mozilla.org/ru/docs...)
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#async #defer #websocket
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