HTTP headers
Last-Modified HTTP Header Meaning
Last-Modified gives the time a resource was last changed.
Meaning
The server is providing a timestamp validator for future conditional requests.
Where it appears
Servers send it on responses for static files, documents, and other cacheable resources.
What to check
Check whether the timestamp really changes with the content and whether ETag is also available.
Example
Last-Modified: Wed, 21 Oct 2015 07:28:00 GMTReferences
- Registry
- IANA HTTP Field Name Registry
- Guide
- MDN Last-Modified