HTTP Status Code Reference

Instant lookup for any HTTP status code — meaning, common causes, and how to fix it. Full data table in references/codes.md. Zero dependencies, fully offline.

When to use

• "What does 429 mean?"
• "I'm getting a 502 from my API, what's wrong?"
• "What's the difference between 401 and 403?"
• "Which 5xx errors are retryable?"
• "What does Cloudflare 524 mean?"

Code ranges (quick orientation)