HTTP Header Reference
Search a curated list of the HTTP headers you actually meet day to day and read a short, plain explanation of what each one does and whether it is used on requests, responses or both. Type a word like cache, cors, security or content to filter the list down to the relevant headers. HTTP has a large and ever growing set of headers, and it is easy to forget exactly what a given one controls, so a quick searchable reference saves a trip to the specification when you are debugging caching, CORS, authentication or security policies. Each entry notes the typical direction so you know whether to set it on the client or the server. The whole list is built into the page, so it works instantly and offline, and nothing you search for is ever sent to a server.
How to use HTTP Header Reference
- Search for a header by name.
- Read what the header does and where it is used.
- Browse related request or response headers.
Frequently asked questions
What headers does it list?
It lists common HTTP request and response headers and explains what each one does, such as Content-Type, Cache-Control and Authorization.
Does it separate request and response headers?
Yes, each header entry notes whether it is typically sent by the client in a request or by the server in a response.
Is this a live header inspector?
No, it is an offline reference for what each header means; it does not fetch or read headers from a live site.
What is HTTP Header Reference?
Search a curated list of the HTTP headers you actually meet day to day and read a short, plain explanation of what each one does and whether it is used on requests, responses or both. Type a word like cache, cors, security or content to filter the list down to the relevant headers.
Is HTTP Header Reference free to use?
Yes. HTTP Header Reference is completely free, with no sign-up and no usage limits.
Does HTTP Header Reference work in a web browser?
Yes. HTTP Header Reference runs in any modern web browser. There is nothing to download or install.
Is my data private with HTTP Header Reference?
Yes. HTTP Header Reference runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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