HTTP If-Unmodified-Since Header

By: Dusty Arlia
Published on Tuesday, June 17, 2014, 06:45 PM
Last Updated on Saturday, July 11, 2015 at 2:37 PM
Total Updates: 3

The If-Unmodified-Since HTTP header tells the web server to only send the HTTP response if the entity has not been modified since the specified date and time. Here is an example:

If-Unmodified-Since: Sat, 29 Oct 1994 19:43:31 GMT