Find all needed information about If Modified Since Apache Support. Below you can see links where you can find everything you want to know about If Modified Since Apache Support.
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/If-Modified-Since
If the request has not been modified since, the response will be a 304 without any body; the Last-Modified response header of a previous request will contain the date of last modification. Unlike If-Unmodified-Since, If-Modified-Since can only be used with a GET or HEAD. When used in combination with If-None-Match, it is ignored, unless the server doesn't support If-None-Match. The most common …
https://issues.apache.org/jira/browse/HBASE-493
Write-If-Not-Modified-Since for optimistic concurrency control: Client retrieves cell (or row) and stores timestamp. Client writes to same cell (or row) and passes timestamp. If the cell's (or row's) latest timestamp matches the passed timestamp, the write succeeds. If the timestamps do not match, the write fails and the client is notified.
https://wordpress.org/support/topic/support-for-if-modified-since-header/
The If-Modified-Since header is a request header, not a response header. As such, it is sent from the browser with the request and should not appear in the response. It would make no sense for @zinoui to implement this in a server-side plugin. The browser would simply ignore it.
http://sebastians-pamphlets.com/dynamic-pages-can-support-if-modified-since-too/
Fortunately, Apache comes with native support of the Last-Modified / If-Modified-Since / Not-Modified functionality. That means that crawlers and your Web server don’t produce too much network traffic when a requested static file didn’t change since the last crawl.
http://apache-http-server.18135.x6.nabble.com/Mod-Expires-quot-If-Modified-Since-quot-Problem-td4728771.html
and I also see a expires header sent by apache, but when I load it the second time, i see that the number of packets between apache and IE have reduced but , IE still sends requests for *.gif files and apache responds with a 200 OK header, and sends all the gif's again, but surprising IE sends a If-Modified-Since header for objects like *.js, *.css, even though I haveen't included them in the ...
https://forums.cpanel.net/threads/how-to-enable-if-modified-since-header.237421/
Nov 04, 2011 · Hello, Could anyone kindly explain how to enable "If-Modified-Since header" with apache. Checking the apache modules, i could see the necessary modules (mod_expires and mod_headers) is enabled by default. Apache version 2.21 CloudLinux Server release 5.7 I tried to add following lines to...
https://httpd.apache.org/docs/2.4/caching.html
When a Last-Modified header exists in the original cached response, mod_cache will add an If-Modified-Since header to the request to the origin server. Performing either of these actions makes the request conditional.
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