a custom http server implementation for our tests that is built on top of the http server module handy when we need to deal with details which httpbin can not capture with httpserver as server yield 0 1 formatserver socket getsockname pytest fixturescopefunction def localhosthttpserver a custom http server implementation for our tests that is built on top of the http server module handy when we need to deal with details which httpbin can not capture just like the http_server but uses the static localhost name for the host
import threading
import json

from collections import defaultdict
from contextlib import contextmanager
from http import HTTPStatus
from http.cookies import SimpleCookie
from http.server import HTTPServer, BaseHTTPRequestHandler
from urllib.parse import urlparse, parse_qs

import pytest


class TestHandler(BaseHTTPRequestHandler):
    handlers = defaultdict(dict)

    @classmethod
    def handler(cls, method, path):
        def inner(func):
            cls.handlers[method][path] = func
            return func
        return inner

    def do_generic(self):
        parse_result = urlparse(self.path)
        func = self.handlers[self.command].get(parse_result.path)
        if func is None:
            return self.send_error(HTTPStatus.NOT_FOUND)

        return func(self)

    do_GET = do_generic
    do_POST = do_generic


@TestHandler.handler('GET', '/headers')
def get_headers(handler):
    handler.send_response(200)
    for key, value in handler.headers.items():
        handler.send_header(key, value)
    handler.send_header('Content-Length', 0)
    handler.end_headers()


@TestHandler.handler('GET', '/drip')
def chunked_drip(handler):
    handler.send_response(200)
    accept = handler.headers.get('Accept')
    if accept is not None:
        handler.send_header('Content-Type', accept)
    handler.send_header('Transfer-Encoding', 'chunked')
    handler.end_headers()

    for _ in range(3):
        body = 'test\n'
        handler.wfile.write(f'{len(body):X}\r\n{body}\r\n'.encode('utf-8'))

    handler.wfile.write('0\r\n\r\n'.encode('utf-8'))


@TestHandler.handler('GET', '/stream/encoding/random')
def random_encoding(handler):
    from tests.fixtures import ASCII_FILE_CONTENT, FILE_CONTENT as UNICODE_FILE_CONTENT

    handler.send_response(200)
    handler.send_header('Transfer-Encoding', 'chunked')
    handler.end_headers()

    for body in [
        ASCII_FILE_CONTENT,
        ASCII_FILE_CONTENT,
        UNICODE_FILE_CONTENT,
        UNICODE_FILE_CONTENT,
        UNICODE_FILE_CONTENT,
    ]:
        body += "\n"
        handler.wfile.write(f'{len(body.encode()):X}\r\n{body}\r\n'.encode())

    handler.wfile.write('0\r\n\r\n'.encode('utf-8'))


@TestHandler.handler('POST', '/status/msg')
def status_custom_msg(handler):
    content_len = int(handler.headers.get('content-length', 0))
    post_body = handler.rfile.read(content_len).decode()

    handler.send_response(200, post_body)
    handler.end_headers()


@TestHandler.handler('GET', '/cookies')
def get_cookies(handler):
    cookies = {
        'cookies': {
            key: cookie.value
            for key, cookie in SimpleCookie(handler.headers.get('Cookie')).items()
        }
    }
    payload = json.dumps(cookies)

    handler.send_response(200)
    handler.send_header('Content-Length', len(payload))
    handler.send_header('Content-Type', 'application/json')
    handler.end_headers()
    handler.wfile.write(payload.encode('utf-8'))


@TestHandler.handler('GET', '/cookies/set')
def set_cookies(handler):
    options = parse_qs(urlparse(handler.path).query)

    handler.send_response(200)
    for cookie, [value] in options.items():
        handler.send_header('Set-Cookie', f'{cookie}={value}')

    handler.end_headers()


@TestHandler.handler('GET', '/cookies/set-and-redirect')
def set_cookie_and_redirect(handler):
    handler.send_response(302)

    redirect_to = handler.headers.get('X-Redirect-To', '/headers')
    handler.send_header('Location', redirect_to)

    raw_cookies = handler.headers.get('X-Cookies', 'a=b')
    for cookie in raw_cookies.split(', '):
        handler.send_header('Set-Cookie', cookie)
    handler.end_headers()


@contextmanager
def _http_server():
    server = HTTPServer(('localhost', 0), TestHandler)
    thread = threading.Thread(target=server.serve_forever)
    thread.start()
    yield server
    server.shutdown()
    thread.join()


@pytest.fixture(scope="function")
def http_server():
    

    with _http_server() as server:
        yield '{0}:{1}'.format(*server.socket.getsockname())


@pytest.fixture(scope="function")
def localhost_http_server():
    

    with _http_server() as server:
        yield 'localhost:{1}'.format(*server.socket.getsockname())