main.py

from http.server import BaseHTTPRequestHandler
from urllib.parse import urlparse, parse_qs


def fibonacci(n: int):
    """Return the first `n` Fibonacci numbers."""
    if n <= 0:
        return []
    elif n == 1:
        return [0]
    elif n == 2:
        return [0, 1]

    fib_nums = [0, 1]
    for i in range(2, n):
        fib_nums.append(fib_nums[-1] + fib_nums[-2])

    return fib_nums


class GetFibs(BaseHTTPRequestHandler):
    def do_GET(self):
        query = urlparse(self.path).query
        params = parse_qs(query)

        if "n" not in params:
            self.send_response(422)
            return

        try:
            key = int(params["n"][0])
        except (IndexError, ValueError):
            self.send_response(422)

        nums = fibonacci(key)

        # convert nums from int to string list
        str_nums = [str(n) for n in nums]
        final_nums = ", ".join(str_nums)

        self.send_response(200)
        self.end_headers()
        self.wfile.write(bytes(final_nums, "UTF-8"))
        return


if __name__ == "__main__":
    from http.server import HTTPServer

    httpd = HTTPServer(("", 8000), GetFibs)
    httpd.serve_forever()