/usr/local/lib/swipl/library/ext/http/http/http_dispatch.pl
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 http_redirect(+How, +To, +Request) is det
Redirect to a new location. The argument order, using the Request as last argument, allows for calling this directly from the handler declaration: 
:- http_handler(root(.),
                http_redirect(moved, myapp('index.html')),
                []).
Arguments:
How- is one of moved, moved_temporary or see_other
To- is an atom, a aliased path as defined by http_absolute_location/3. or a term location_by_id(Id) or its abbreviations #(Id) or #(Id)+Parameters. If To is not absolute, it is resolved relative to the current location.