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HTTP Response Header Reference

Browse common HTTP response headers, understand caching, security and delivery-related fields.

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Reference

Response header referenceCache-Control

Controls browser and CDN caching behavior.

15Entries
8Categories
4Security
3Caching
Cache-ControlCaching
Meaning
Controls browser and CDN caching behavior.
Content-TypeContent
Meaning
Describes the MIME type of the response body.
Content-LengthContent
Meaning
Signals the body size in bytes.
Content-EncodingContent
Meaning
Shows compression such as gzip or br.
Content-DispositionDownload
Meaning
Suggests inline display or attachment download.
ETagCaching
Meaning
Entity tag used for validation and conditional requests.
Last-ModifiedCaching
Meaning
Timestamp for cache validation.
LocationRedirect
Meaning
Provides the redirect target or created resource URL.
Set-CookieSession
Meaning
Sets cookies in the browser.
Strict-Transport-SecuritySecurity
Meaning
Forces HTTPS for future visits.
Content-Security-PolicySecurity
Meaning
Controls which resources the page may load.
Access-Control-Allow-OriginCORS
Meaning
Declares which origins may read the response.
X-Frame-OptionsSecurity
Meaning
Limits whether the page can be framed.
Referrer-PolicySecurity
Meaning
Controls the Referer information sent by browsers.
Retry-AfterRate Limit
Meaning
Tells clients when to retry after 429 or 503.

Best For

Look up common HTTP response headers and quickly understand caching, content delivery and security behavior.

Common tasks

  • Explain headers in API reviews
  • Check cache and security settings
  • Teach response header basics to teammates
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