http_parameters/3

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- Reference manual
- Packages
  - SWI-Prolog HTTP support
    - The HTTP server libraries
      - Get parameters from HTML forms
        
        http_parameters/2
        
        http_parameters/3

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

http_parameters(+Request, ?Parameters, +Options)

In addition to http_parameters/2, the following options are defined.

form_data(-Data)

Return the entire set of provided Name=Value pairs from the GET or POST request. All values are returned as atoms.

attribute_declarations(:Goal)

If a parameter specification lacks the parameter options, call call(Goal, +ParamName, -Options) to find the options. Intended to share declarations over many calls to http_parameters/3. Using this construct the above can be written as below.

reply(Request) :-
        http_parameters(Request,
                        [ title(Title),
                          name(Name),
                          age(Age)
                        ],
                        [ attribute_declarations(param)
                        ]),
        ...

param(title, [optional(true)]).
param(name,  [length >= 2 ]).
param(age,   [integer]).