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id(ID)appears in the option list of the handler, ID it is used and takes preference over using the predicate.
If the handler is declared with a pattern, e.g.,
the location to access a particular user may be accessed using
user('Bob'). The number of arguments to the compound term must
match the number of variables in the path pattern.
A plain atom ID can be used to find a handler with a pattern. The
returned location is the path up to the first variable, e.g.,
/user/ in the example above.
User code is adviced to use http_link_to_id/3 which can also add query parameters to the URL. This predicate is a helper for http_link_to_id/3.
location_by_id(ID)or its abbreviation