Python Web代理无法加载HTTPS站点

Question

我正在用Python编写Web代理。我有一个问题，任何时候我尝试加载HTTPS网站（在Firefox中）我收到安全警告错误（我将在下面发布截图）。它会出现（从终端上的程序输出）我的代理发送和接收来自Web服务器的数据，但Firefox没有加载它。我可以像example.com一样加载HTTP网站。我知道我应该为此使用线程，但我想逐步构建。这是我的代码和一些屏幕抓取，以更好地说明正在发生的事情：非常感谢您的帮助！

import sys
import socket

# Constants
PORT = 9876
MAX_BUFFER = 4096
HOST = ''
BACKLOG = 5

def main():
    ''' This is the main function'''
# Start socket
    try:
        clientSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        clientSocket.bind((HOST, PORT))
        clientSocket.listen(BACKLOG)
        print 'Proxy running on %s:%d' % (HOST, PORT)

    except socket.error, (message):
        print message

        if clientSocket:
            clientSocket.close()

        sys.exit(1)

# Listen for requests
    while 1:
    # conn is the socket we can send and receive to/from the client
        print 'Listening to client'
        conn, client_addr = clientSocket.accept()
        request = conn.recv(MAX_BUFFER)

    # Parsing
        webserver, port = ParseHTTP(request)
    # Heard from client, now forward to server
        try:
            print 'Sending request to server'
            serverSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            serverSocket.connect((webserver, port))
            serverSocket.send(request)

            while 1:
                data = serverSocket.recv(MAX_BUFFER)

            # while there is data to receive from server
                if len(data) > 0:
                    conn.send(data)

                else:
                    print 'Completed sending data to client'
                    break

            serverSocket.close()
            conn.close()

        except socket.error, (message):
            print message

            if clientSocket:
                clientSocket.close()

            if conn:
                conn.close()

            if serverSocket:
                serverSocket.close()

            sys.exit(1)

    print 'Goodbye'
#******************End of main*********************

def ParseHTTP(request):
    first_line = request.split('\n')[0]
    print first_line
    url = first_line.split(' ')[1]
    http_pos = url.find('://')
    if http_pos == -1:
        temp = url
    else:
        temp = url[(http_pos + 3):]

    port_pos = temp.find(':')

    webserver_pos = temp.find('/')
    if webserver_pos == -1:
        webserver_pos = len(temp)
    webserver = ''
    port = -1

    if port_pos == -1 or webserver_pos < port_pos:
        port = 80
        webserver = temp[:webserver_pos]

    else:
        port = int((temp[(port_pos + 1):])[:webserver_pos - port_pos -1])
        webserver = temp[:port_pos]

    return webserver, port
#******************End of ParseWebServer()*********************

if __name__ == '__main__':
    main()