Cloudflare Workers Runtime Apis

A comprehensive reference for the core runtime APIs you'll use in every Cloudflare Workers project. Covers fetch with timeout and retry patterns, streaming transforms for large payloads, crypto operations like SHA-256 and HMAC signing, cache API usage with waitUntil, WebSocket handling through Durable Objects with hibernation, and text encoding. The real value is in the error prevention table that shows you how to avoid the ten most common mistakes, like trying to read response bodies twice or forgetting to set fetch timeouts before hitting the 30 second worker limit. Load this when you're debugging stream locks, setting up caching, or implementing real-time connections.