Document usage of Vaadin interernal requests (/VAADIN/*, etc.) #4622
Description
In a Vaadin Flow app, we can observe many requests being made to the application, which are framework internal.
Typically these requests have the url of /VAADIN/*
While users can observe these from the browser network tools, there is no documentation regarding what these are and what they do.
It would be nice to have atleast the nature of these requests documented, with some guidance for users along the lines of whether these urls should be protected behind an authentication layer or not.
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