| This class is an optional filter that will validate query data according to the velosurf.entity query parameter
(may be multivalued).
If data pass all validation constraints, the filter will let the request pass towards the form action. Otherwise,
it will redirect back the user to the original form (using the referer query header). In this case, the filter will
populate the session with the given values (escaped) so that they can be put back in the form.
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