How web servers use different ports to listen for requests and establish TCP connections

I"m going to write a simple web server with python to listen for requests on one port, and then process them on another port to establish a
TCP connection. Because the client sends the request with the destination port number, how can the server establish a TCP connection on another port?
such as 

clientSocket.connect(xxxx, port1)

then the server: 

connectionSocket, addr = serverSocket.accept()

has a connection been established on the port1 port? How do I establish a connection on the port2 port?

Python web
Nov.22,2021

the question is not clear: do you want to build a web server, a low-level "TCP server" or a high-level "HTTP server"?
seeing that the connect and accept methods are used in your code, I'll assume it's the first.
then, I feel that you are quite unclear about the concept of socket programming. The socket on the server side must be bound to a fixed address tuple (IP+ port). How can you change the port casually after binding?

post the single-threaded TCP server-client code I used when I was self-taught for your reference. If you don't understand, you can go through the "Socket Programming HOWTO" in the official manual first. 

"""TCP:echo-server"""
import socket
import argparse

def server(host, port):
    """"""
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock: -sharp
        sock.bind((host, port)) -sharp+
        sock.listen() -sharp
        print('listening at:', sock.getsockname())
        while True: -sharp
            conn, addr = sock.accept() -sharp
            with conn: -sharp
                print('connected by', addr)
                while True: -sharprecvallsend
                    data = conn.recv(1024) -sharp"" 1024
                    if not data: -sharpdata
                        break -sharp - conn
                    conn.sendall(data) -sharpdata
                    print('echoing', repr(data), 'to', addr)

def client(host, port):
    """"""
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
        sock.connect((host, port)) -sharp
        sock.sendall(b'simple is better than complex.') -sharp
        sock.shutdown(socket.SHUT_WR) -sharpsendrecvall
        while True: -sharprecvall
            data = sock.recv(1024) -sharp"" 1024
            print('received:', data)
            if not data: -sharpdata
                print('server socket closed.')
                break -sharp - sock

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description='an echo-server using context manager')
    parser.add_argument('-n', metavar='hostname', default='127.0.0.1')
    parser.add_argument('-p', metavar='port', type=int, default=65432)
    parser.add_argument('-c', action='store_true', help='run as the client')
    args = parser.parse_args()
    run = client if args.c else server -sharp'-c'args.cNone
    run(args.n, args.p)

Previous: Redis monitoring was added in supervisor, but no command was found.

Next: Always prompting that I can't find fs,. I've already followed the prompts, or is it the same problem?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-4296952-57ed.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-4296952-57ed.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?