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📨 HTTP Headers Reference
Every HTTP header that shows up in real-world traffic. Search by name or category. Each entry: header name, request or response, one-line meaning, and a real example value.
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Examples
Common
Output
Accept (request) · Content-Type (both) · Authorization (request) · Set-Cookie (response) · Cache-Control (both) · Strict-Transport-Security (response)Frequently asked questions
Why are some headers in both request and response?
Cache-Control and Content-Type apply in both directions. A POST request also has a body with Content-Type. Cache-Control on a request tells caches what the client wants; on a response it tells caches how to handle storage.
About this calculator
HTTP Headers Reference runs entirely in your browser using standard formulas. No data is sent to any server. We don't share your inputs with lenders, brokers, or anyone else — there's no funnel and no follow-up email.
Related tools
- 🔧 HTTP Methods Reference — GET, POST, PUT, DELETE, PATCH, OPTIONS, HEAD — when to use each.
- 🌐 HTTP Status Codes — Searchable reference of HTTP status codes (1xx, 2xx, 3xx, 4xx, 5xx).
- 🍪 Cookie Parser — Parse and decode HTTP Cookie / Set-Cookie headers into key-value pairs.
Why this tool
vs typical free network-tools sites
| NetToolset | Typical free site | |
|---|---|---|
| Price | Free | Free |
| Signup required | No | Often (for advanced features) |
| Ads inside the tool | No | Yes (banner + interstitial) |
| Logs your IP / queries | No | Yes (often resold) |
| Data sent to a server | Math runs in browser; lookups hit Cloudflare DoH directly | Yes (all goes through their server) |
| Open source | Yes | No |
| Bookmarkable URL per tool | Yes | Mixed |
| Multilingual | EN / ES / PT / FR / DE | Usually EN only |
| Loads in under 1s | Yes (static) | Often slow (ad tracking) |