SWI-Prolog -- http_location_by

Availability::- use_module(library(http/http_dispatch)).

[det]http_location_by_id(+ID, -Location)

Find the HTTP Location of handler with ID. If the setting (see setting/2) http:prefix is active, Location is the handler location prefixed with the prefix setting. Handler IDs can be specified in two ways:

id(ID): If this appears in the option list of the handler, this it is used and takes preference over using the predicate.
M : PredName: The module-qualified name of the predicate.
PredName: The unqualified name of the predicate.

Errors: existence_error(http_handler_id, Id).
deprecated: The predicate http_link_to_id/3 provides the same functionality with the option to add query parameters or a path parameter.