如何在Python中正确获取当前URL地址？

from flask import Flask, request

app = Flask(__name__)

@app.route('/')
def index():
    current_url = request.url
    return f"Current URL: {current_url}"

if __name__ == '__main__':
    app.run()

from django.http import HttpResponse

def index(request):
    current_url = request.build_absolute_uri()
    return HttpResponse(f"Current URL: {current_url}")

from http.server import BaseHTTPRequestHandler, HTTPServer

class MyHandler(BaseHTTPRequestHandler):
    def do_GET(self):
        current_url = self.path
        self.send_response(200)
        self.send_header('Content-type', 'text/html')
        self.end_headers()
        self.wfile.write(bytes(f"Current URL: {current_url}", 'utf-8'))

if __name__ == '__main__':
    server = HTTPServer(('localhost', 8000), MyHandler)
    server.serve_forever()