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HTTP header reference
Last-Modified
← All headers
Response header
What is a Last-Modified header?
The date and time the resource was last changed, used for cache validation via If-Modified-Since.
Other Response headers
Access-Control-Allow-Origin
Access-Control-Allow-Credentials
Access-Control-Expose-Headers
Access-Control-Max-Age
Access-Control-Allow-Methods
Access-Control-Allow-Headers
Accept-Patch
Accept-Ranges
Age
Allow
Alt-Svc
Content-Disposition
Content-Language
Content-Location
Content-Range
ETag
Expires
Link
Location
Proxy-Authenticate
Retry-After
Server
Set-Cookie
Strict-Transport-Security
Vary
WWW-Authenticate
X-Frame-Options
Content-Security-Policy
Permissions-Policy
X-Content-Type-Options
X-XSS-Protection
X-Powered-By
X-UA-Compatible
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