Bits of .NET

🔒 Enable High-Performance Features Like SharedArrayBuffer

Spectre attack disabled SharedArrayBuffer. COOP + COEP re-enable it safely. Required for multi-threading, high-performance computing in browser.

📝 Required Headers

# Server headers
Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp

# In HTML (or via meta tags)
<meta http-equiv="Cross-Origin-Opener-Policy" content="same-origin">
<meta http-equiv="Cross-Origin-Embedder-Policy" content="require-corp">

# Express.js example
app.use((req, res, next) => {
  res.setHeader('Cross-Origin-Opener-Policy', 'same-origin');
  res.setHeader('Cross-Origin-Embedder-Policy', 'require-corp');
  next();
});

✅ Why You Need This

• Enables SharedArrayBuffer (multi-threading in Web Workers)
• Enables performance.measureMemory() API
• Prevents Spectre-like side-channel attacks
• Required for certain WebAssembly features