如何在Python中创建服务器(localhost)，然后将数据发送到url/ server，然后检索数据？

import http.server
import socketserver
import urllib.parse
import json

class MyRequestHandler(http.server.BaseHTTPRequestHandler):
    def do_POST(self):
        content_length = int(self.headers['Content-Length'])
        post_data = self.rfile.read(content_length)
        # 处理接收到的数据
        # ...

        # 构造响应数据
        response_data = {'message': 'Data received successfully'}
        response_json = json.dumps(response_data).encode('utf-8')

        # 发送响应
        self.send_response(200)
        self.send_header('Content-Type', 'application/json')
        self.send_header('Content-Length', len(response_json))
        self.end_headers()
        self.wfile.write(response_json)

    def do_GET(self):
        # 处理GET请求
        # ...

def run_server():
    host = 'localhost'
    port = 8000
    server_address = (host, port)
    httpd = socketserver.TCPServer(server_address, MyRequestHandler)
    print(f'Server running at {host}:{port}')
    httpd.serve_forever()

if __name__ == '__main__':
    run_server()

import requests

url = 'http://localhost:8000/server'
data = {'key': 'value'}
response = requests.post(url, json=data)
print(response.json())