prolog-web-serviceslisted

# Prolog Web Services & HTTP API Guidelines Use this skill when building HTTP REST APIs, microservices, or JSON web endpoints directly in Prolog. ## 1. Engine Web Frameworks ### SWI-Prolog HTTP Dispatcher ```prolog :- use_module(library(http/thread_http_server)). :- use_module(library(http/http_dispatch)). :- use_module(library(http/http_json)). :- http_handler(root(api/solve), solve_handler, []). server(Port) :- http_server(http_dispatch, [port(Port)]). solve_handler(Request) :- http_read_json_dict(Request, DictIn), % Perform logic... reply_json_dict(_{status: "success", result: [1, 2, 3]}). ``` ### Scryer Prolog HTTP Server & Client ```prolog :- use_module(library(http/http_open)). fetch_url(URL, Content) :- http_open(URL, Stream, []), get_char(Stream, Char), % Read stream contents into chars list... close(Stream). ``` --- ## 2. JSON Serialization Standards - Represent JSON objects in ISO Prolog as terms or character lists (`chars`). - Keep request validation pure by parsing incoming payloads via DCGs (`phrase(json_ast(AST), Chars)`). --- ## 3. Microservice Architecture & Safety - Run Prolog HTTP microservices behind a reverse proxy (e.g. Nginx, Caddy, or Envoy). - Apply system resource quotas and timeouts via `prolog-safe`.