[racket] Try-Racket.org

Hi,
i'm trying to understand how Try-Recket Console "post"s a .ajax request to
the server and
where ist the server, url? could please some  one explain?
there is also json-parse and 3 .rkt files,
but I just don't get is how they will be called and executed!
As i mentioned before I just want to use the same console like by TryRacket
but in my own Website with none-english explaination! thank you..
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