Syntax: expires [modified] time;expires
epoch |
max |
off; Default: expires off; Context: http, server, location, if in location
Enables or disables adding or modifying the “Expires” and “Cache-Control” response header fields provided that the response code equals 200, 201, 204, 206, 301, 302, 303, 304, or 307. The parameter can be a positive or negative time.
The time in the “Expires” field is computed as a sum of the current time and time specified in the directive