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HTTP Header Reference

Searchable reference of 65+ HTTP headers with descriptions, examples, and categories. Covers request, response, caching, security, CORS, authentication, conditional, and cookie headers. Runs entirely in your browser — your data never leaves your machine.

http headers reference api cors security caching

Published May 29, 2026

All interactive tools run entirely in your browser. Your data never leaves your device.

How It Works

Browse and search through a comprehensive collection of HTTP headers. Filter by category (General, Request, Response, Caching, Security, CORS, Content, Authentication, Conditional, Cookie) and expand any header to see its description and a real-world example value.

Features

  • 65+ HTTP headers: covers standard and common non-standard headers
  • 10 categories: General, Request, Response, Caching, Security, CORS, Content, Authentication, Conditional, Cookie
  • Full-text search: search by header name, description, or example
  • Type indicators: request, response, or both (bidirectional)
  • Standard badges: marks non-standard headers (X-Forwarded-For, X-Frame-Options, etc.)
  • Expandable details: description and example for each header
  • Color-coded categories: visual distinction between header groups
  • Private: runs entirely in the browser — no data transmitted

Use Cases

  • Looking up the correct header name and syntax during API development
  • Understanding CORS headers when debugging cross-origin requests
  • Reviewing security headers for production hardening checklists
  • Learning about caching headers for performance optimization
  • Quick reference for authentication header formats