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+# Cloudflare Workers Runtime APIs
+
+Key runtime APIs for Workers development.
+
+## Fetch API
+
+```typescript
+// Subrequest
+const response = await fetch('https://api.example.com/data', {
+  method: 'POST',
+  headers: { 'Content-Type': 'application/json' },
+  body: JSON.stringify({ key: 'value' }),
+  cf: {
+    cacheTtl: 3600,
+    cacheEverything: true
+  }
+});
+
+const data = await response.json();
+```
+
+## Headers API
+
+```typescript
+// Read headers
+const userAgent = request.headers.get('User-Agent');
+
+// Cloudflare-specific
+const country = request.cf?.country;
+const colo = request.cf?.colo;
+const clientIP = request.headers.get('CF-Connecting-IP');
+
+// Set headers
+const headers = new Headers();
+headers.set('Content-Type', 'application/json');
+headers.append('X-Custom-Header', 'value');
+```
+
+## HTMLRewriter
+
+```typescript
+export default {
+  async fetch(request: Request): Promise<Response> {
+    const response = await fetch(request);
+
+    return new HTMLRewriter()
+      .on('title', {
+        element(element) {
+          element.setInnerContent('New Title');
+        }
+      })
+      .on('a[href]', {
+        element(element) {
+          const href = element.getAttribute('href');
+          element.setAttribute('href', href.replace('http://', 'https://'));
+        }
+      })
+      .transform(response);
+  }
+};
+```
+
+## WebSockets
+
+```typescript
+export default {
+  async fetch(request: Request): Promise<Response> {
+    const upgradeHeader = request.headers.get('Upgrade');
+    if (upgradeHeader !== 'websocket') {
+      return new Response('Expected WebSocket', { status: 426 });
+    }
+
+    const pair = new WebSocketPair();
+    const [client, server] = Object.values(pair);
+
+    server.accept();
+
+    server.addEventListener('message', (event) => {
+      server.send(`Echo: ${event.data}`);
+    });
+
+    return new Response(null, {
+      status: 101,
+      webSocket: client
+    });
+  }
+};
+```
+
+## Streams API
+
+```typescript
+const { readable, writable } = new TransformStream();
+
+const writer = writable.getWriter();
+writer.write(new TextEncoder().encode('chunk 1'));
+writer.write(new TextEncoder().encode('chunk 2'));
+writer.close();
+
+return new Response(readable, {
+  headers: { 'Content-Type': 'text/plain' }
+});
+```
+
+## Web Crypto API
+
+```typescript
+// Generate hash
+const data = new TextEncoder().encode('message');
+const hashBuffer = await crypto.subtle.digest('SHA-256', data);
+const hashArray = Array.from(new Uint8Array(hashBuffer));
+const hashHex = hashArray.map(b => b.toString(16).padStart(2, '0')).join('');
+
+// HMAC signature
+const key = await crypto.subtle.importKey(
+  'raw',
+  new TextEncoder().encode('secret'),
+  { name: 'HMAC', hash: 'SHA-256' },
+  false,
+  ['sign', 'verify']
+);
+
+const signature = await crypto.subtle.sign('HMAC', key, data);
+const valid = await crypto.subtle.verify('HMAC', key, signature, data);
+
+// Random values
+const randomBytes = crypto.getRandomValues(new Uint8Array(32));
+const uuid = crypto.randomUUID();
+```
+
+## Encoding APIs
+
+```typescript
+// TextEncoder
+const encoder = new TextEncoder();
+const bytes = encoder.encode('Hello');
+
+// TextDecoder
+const decoder = new TextDecoder();
+const text = decoder.decode(bytes);
+
+// Base64
+const base64 = btoa('Hello');
+const decoded = atob(base64);
+```
+
+## URL API
+
+```typescript
+const url = new URL(request.url);
+const hostname = url.hostname;
+const pathname = url.pathname;
+const search = url.search;
+
+// Query parameters
+const name = url.searchParams.get('name');
+url.searchParams.set('page', '2');
+url.searchParams.delete('old');
+```
+
+## FormData API
+
+```typescript
+// Parse form data
+const formData = await request.formData();
+const name = formData.get('name');
+const file = formData.get('file');
+
+// Create form data
+const form = new FormData();
+form.append('name', 'value');
+form.append('file', blob, 'filename.txt');
+```
+
+## Response Types
+
+```typescript
+// Text
+return new Response('Hello');
+
+// JSON
+return Response.json({ message: 'Hello' });
+
+// Stream
+return new Response(readable);
+
+// Redirect
+return Response.redirect('https://example.com', 302);
+
+// Error
+return new Response('Not Found', { status: 404 });
+```
+
+## Request Cloning
+
+```typescript
+// Clone for multiple reads
+const clone = request.clone();
+const body1 = await request.json();
+const body2 = await clone.json();
+```
+
+## AbortController
+
+```typescript
+const controller = new AbortController();
+const { signal } = controller;
+
+setTimeout(() => controller.abort(), 5000);
+
+try {
+  const response = await fetch('https://slow-api.com', { signal });
+} catch (error) {
+  if (error.name === 'AbortError') {
+    console.log('Request timed out');
+  }
+}
+```
+
+## Scheduling APIs
+
+```typescript
+// setTimeout
+const timeoutId = setTimeout(() => {
+  console.log('Delayed');
+}, 1000);
+
+// setInterval
+const intervalId = setInterval(() => {
+  console.log('Repeated');
+}, 1000);
+
+// Clear
+clearTimeout(timeoutId);
+clearInterval(intervalId);
+```
+
+## Console API
+
+```typescript
+console.log('Info message');
+console.error('Error message');
+console.warn('Warning message');
+console.debug('Debug message');
+
+// Structured logging
+console.log(JSON.stringify({
+  level: 'info',
+  message: 'Request processed',
+  url: request.url,
+  timestamp: new Date().toISOString()
+}));
+```
+
+## Performance API
+
+```typescript
+const start = performance.now();
+await processRequest();
+const duration = performance.now() - start;
+console.log(`Processed in ${duration}ms`);
+```
+
+## Bindings Reference
+
+### KV Operations
+```typescript
+await env.KV.put(key, value, { expirationTtl: 3600, metadata: { userId: '123' } });
+const value = await env.KV.get(key, 'json');
+const { value, metadata } = await env.KV.getWithMetadata(key);
+await env.KV.delete(key);
+const list = await env.KV.list({ prefix: 'user:' });
+```
+
+### D1 Operations
+```typescript
+const result = await env.DB.prepare('SELECT * FROM users WHERE id = ?').bind(userId).first();
+const { results } = await env.DB.prepare('SELECT * FROM users').all();
+await env.DB.prepare('INSERT INTO users (name) VALUES (?)').bind(name).run();
+await env.DB.batch([stmt1, stmt2, stmt3]);
+```
+
+### R2 Operations
+```typescript
+await env.R2.put(key, value, { httpMetadata: { contentType: 'image/jpeg' } });
+const object = await env.R2.get(key);
+await env.R2.delete(key);
+const list = await env.R2.list({ prefix: 'uploads/' });
+const multipart = await env.R2.createMultipartUpload(key);
+```
+
+### Queue Operations
+```typescript
+await env.QUEUE.send({ type: 'email', to: 'user@example.com' });
+await env.QUEUE.sendBatch([{ body: msg1 }, { body: msg2 }]);
+```
+
+### Workers AI
+```typescript
+const response = await env.AI.run('@cf/meta/llama-3-8b-instruct', {
+  messages: [{ role: 'user', content: 'What is edge computing?' }]
+});
+```
+
+## Resources
+
+- Runtime APIs: https://developers.cloudflare.com/workers/runtime-apis/
+- Web Standards: https://developers.cloudflare.com/workers/runtime-apis/web-standards/
+- Bindings: https://developers.cloudflare.com/workers/runtime-apis/bindings/