HTTP/1.0 headers, con’t
Last-Modified - returned by server
- Last-Modified: Sat, 29 Oct 1994 19:43:31 GMT
- semantically imprecise - file modification? Record timestamp? Date in case file dynamically generated?
- used with If-Modified-Since and HEAD method
Location - returned by server
- Location: http://www.cs.ubc.ca
- used in case of 3xx redirections
Pragma - sent by client or server
- Pragma: no-cache
- extensibility mechanism. No-cache is the only popularly used pragma, AFAIK