API — Application Programming Interface

Save this as local_api.py and run it with Python 3. It binds only to your own computer at 127.0.0.1. This teaching server has no authentication and is not a production service. The permission checkbox above is a separate simulation, not a feature of this code.

# Python 3: a complete local teaching API. No external packages.
from http.server import BaseHTTPRequestHandler, HTTPServer
import json

records = {"A01": {"id": "A01", "title": "Fictional supply agreement", "pages": 4},
           "A02": {"id": "A02", "title": "Fictional inspection email", "pages": 1}}

class Handler(BaseHTTPRequestHandler):
    def do_GET(self):
        prefix = "/documents/"
        key = self.path[len(prefix):] if self.path.startswith(prefix) else ""
        data = records.get(key)
        status = 200 if data else 404
        body = json.dumps(data or {"error": "Document not found"}).encode()
        self.send_response(status)
        self.send_header("Content-Type", "application/json")
        self.send_header("Content-Length", str(len(body)))
        self.end_headers()
        self.wfile.write(body)

HTTPServer(("127.0.0.1", 8765), Handler).serve_forever()

With the server running, open a second terminal and run this client:

python -c "import urllib.request; print(urllib.request.urlopen('http://127.0.0.1:8765/documents/A01').read().decode())"

The client makes an HTTP request; the server looks up the ID and returns JSON. Stop the server with Control+C. No language model is involved: an API can expose ordinary data as well as AI services.