html - Control of reqested files, how to? -

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I have noticed that when navigating only received a file request from the server event, in the HTML while playing with Falcon Tutorial .

http: //188.240.2.29000000/ If you navigate between the menus, only GET is created, when F5 calls the Refresh page with additional files is done.

In the same way I saw with other websites: StackOverflow has 9 files, while 29 are with F5, reddit typically has 15 files which are called 35 files refreshing F5.

I want to know how it is achieved and how it can be implemented in other websites.

Not only about the Falcon, but it's about you can read more about it And how to implement it, and

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