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HTTP Request Header Reference

Look up common HTTP request headers and quickly review client, auth and caching related fields.

Workspace

Work here first, inspect the output, then decide the next move.
WorkflowLocal

This workspace processes the content directly in your browser.

Formatting, decoding, validation, and common file work stay local whenever possible, then continue in the same result area for copy, download, or the next step.

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Input

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Process

The content stays in the local browser by default.

Result

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Header name or keyword
Search stays local in the browser and filters the reference rows instantly.

Reference

Request header referenceAccept

Tells the server which content types the client prefers.

13Entries
3Caching
1Authentication
1Client profile
AcceptContent negotiation
Meaning
Tells the server which content types the client prefers.
Accept-LanguageLocalization
Meaning
Lists preferred languages for the response.
AuthorizationAuthentication
Meaning
Carries Bearer tokens, Basic auth or other credentials.
Cache-ControlCaching
Meaning
Influences caching behavior for the request.
Content-TypePayload
Meaning
Describes the MIME type of the request body.
CookieSession
Meaning
Sends browser cookies back to the server.
If-None-MatchCaching
Meaning
Sends an ETag for conditional fetches.
If-Modified-SinceCaching
Meaning
Checks whether a resource changed since a date.
OriginCORS
Meaning
Identifies the calling origin for CORS requests.
RefererNavigation
Meaning
Shows the page URL that initiated the request.
User-AgentClient profile
Meaning
Identifies the browser, runtime or client app.
X-Forwarded-ForProxy
Meaning
Carries the original client IP through proxies.
X-Requested-WithAJAX
Meaning
Legacy indicator commonly used by JavaScript frameworks.

Best For

Review what common request headers mean before you debug auth, CORS, cookies or browser behavior.

Common tasks

  • Understand auth and session headers
  • Check browser request metadata
  • Teach request header differences quickly
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Key Questions