Content Delivery Network and how it is used

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In addition, the load already placed on resources and the quality of the connection are also taken into account. The CDN routing mechanism redirects the request to the selected server, which responds by displaying the cached copy of the requested page.

CDN:
“Pull” and “Push” mode

Generally, CDNs offer two modes of operation for distributing static page files to their mirror servers: “pull” and “push”.

Pull mode is activated the first time netherlands cell phone number list a page needs to be displayed. In this case, the delivery network automatically fetches the necessary content from the origin server and delivers it to the visitor. At the same time, it caches that version of the page on those mirror servers. Moreover, it is kept until the configured content lifetime expires.


On subsequent occasions, the best-placed mirror server processes the request, making sure to serve the content to ensure fast loading on the user's terminal.

In this scenario, the CDN takes care of everything and there is no need to “push” updates to it.

And what happens when the time expires? In this case, the CDN retrieves the most recent version of the content from the hosting server and delivers it to its mirror servers.