June 1999
Intermediate to advanced
540 pages
21h 39m
English
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Name
If-Modified-Since
Synopsis
If-Modified-Since:
date
Description
Specifies that the URI data is to be sent only if it has been modified
since the date given as the value of this header. This is useful for
client-side caching. If the document has not been modified, the server
returns a code of 304, indicating that the client should use the local copy.
The specified date should follow the format described under the
Date header.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.