HTTP Header Reference
Search common HTTP headers and see what they are usually used for.
Look up any HTTP header
HTTP headers control caching, security, content type, and more, and it is hard to remember what each one does. This searchable reference explains common request and response headers in plain language, so you can confirm a header’s purpose in seconds.
It complements a header parser: when you spot an unfamiliar header in a response, look it up here to understand what it is doing. Search by name or keyword and get a concise explanation of what the header controls and when to use it.
Look it up, locally
Each entry explains what the header controls — caching, security, content type — so you can set it with confidence. The reference runs entirely in your browser.
Frequently Asked Questions
What does the http header reference do?
It processes pasted developer text in your browser and writes a usable result to the output panel.
Does this send code or data to a server?
No. The tool runs client-side in your browser and does not upload your input.
What are the limits?
It is designed for everyday snippets, configuration values, and small files rather than huge production datasets.
Is this free?
Yes. It is a free browser utility with no account required.
Practical utilities for everyday web development work.