/usr/lib/swipl/library/http/http_parameters.pl
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 http_convert_parameters(+Data, ?Params) is det
 http_convert_parameters(+Data, ?Params, :AttrDecl) is det
Implements the parameter translation of http_parameters/2 or http_parameters/3. I.e., http_parameters/2 for a POST request can be implemented as: 
http_parameters(Request, Params) :-
    http_read_data(Request, Data, []),
    http_convert_parameters(Data, Params).