HTTP Headers Reference
NetworkSearchable reference for 80+ HTTP request and response headers
Search by header name like `Cache-Control` to quickly recall its syntax and valid directive values mid-debug, or browse split by request versus response headers when you've seen something in the wild and aren't sure which category it belongs to. A less common one like `Sec-Fetch-Site` or `Vary` is exactly the kind of thing worth looking up here before writing server logic that depends on it. It covers 80+ of the most commonly used standard headers with real example values alongside each definition, based on current MDN and RFC documentation, though some highly specialized or vendor-specific headers may not be included, and newly proposed headers are worth cross-checking against the latest spec directly. Security-related headers like CSP and HSTS are covered too, though for actually building out a full CSP policy the dedicated CSP Header Builder is the better tool. It's a static reference: nothing you search is sent anywhere.
How to use HTTP Headers Reference
- 1.Search by header name (e.g. `Cache-Control`) to quickly recall its syntax and valid directive values while debugging.
- 2.Browse by request vs response headers when you're not sure which category a header you've seen in the wild belongs to.
- 3.Look up a less common header (like `Sec-Fetch-Site` or `Vary`) to understand what it signals before writing server logic around it.
Frequently asked questions
Use via API, SDK, or MCP
cURLcurl "https://api.utilix.tech/v1/tools/http-headers" \
-H "Authorization: Bearer utx_live_..."
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