HTTP Headers Reference
Look up common HTTP request and response headers in a searchable directory — filter by direction and category, read a one-line description and a realistic example, and copy any header name with one click. In your browser, free.
Every common HTTP request and response header, explained with a real-world example. Everything runs in your browser from a built-in reference — nothing is sent to the server.
| Header | Direction | Category | Description | Example |
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About HTTP Headers Reference
The HTTP Headers Reference is a searchable directory of the request and response headers you actually meet in real traffic. Each entry names the header, states in one line what it does, and shows a realistic example value — Cache-Control: max-age=3600 rather than an abstract placeholder — so you can lift working syntax straight into your code or config.
The list slices two ways at once: by direction, separating request headers, response headers and those that travel both ways, and by category — General, Authentication, Caching, Conditionals, Connection, Content, CORS, Cookies, Security, Range, Proxies and WebSockets. That makes it as quick to answer “which headers control caching?” as “what does this header in my DevTools trace mean?”.
Header names and example values each copy to the clipboard in one click, and everything runs in your browser from a built-in table — nothing you search for is sent anywhere.
How to use HTTP Headers Reference
- Search for a header by name, meaning or example value — for example Cache-Control, cookie or bearer.
- Use the direction filter to limit results to request headers, response headers or both.
- Pick a category chip — such as Caching, CORS or Security — to browse one concern at a time.
- Read the one-line description and the realistic example value for each header.
- Click to copy the header name or the example value into your code or configuration.