Write a simple TCP program for a server that accepts lines of input from a client and prints the lines onto the server’s standard output. (You can do this by modifying the TCPServer.py program in the text.) Compile and execute your program. On any other machine that contains a Web browser, set the proxy server in the browser to the host that is running your server program; also configure the port number appropriately. Your browser should now send its GET request messages to your server, and your server should display the messages on its standard output. Use this platform to determine whether your browser generates conditional GET messages for objects that are locally cached.

Sure, I can help you with that. Here is a simple TCP program for a server that accepts lines of input from a client and prints the lines onto the server’s standard output:

import socket

HOST = ''  # Symbolic name meaning all available interfaces
PORT = 5000  # Arbitrary non-privileged port

# Create a TCP/IP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# Bind the socket to a specific address and port
sock.bind((HOST, PORT))

# Listen for incoming connections
sock.listen(1)

print('Server listening on port', PORT)

while True:
    # Wait for a connection
    print('Waiting for a client connection...')
    conn, addr = sock.accept()
    print('Connected by', addr)

    # Receive data from the client and print it to the server's standard output
    while True:
        data = conn.recv(1024)
        if not data:
            break
        print(data.decode('utf-8'))

    # Close the connection
    conn.close()
    print('Client disconnected')

To compile and execute the program, save it as `server.py` and run it from the command line using the command `python server.py`.

To test the program, you can open a Web browser on another machine and set the proxy server in the browser to the host that is running your server program (e.g. `localhost` or the IP address of the machine running the server). Then, configure the port number appropriately (in this case, `5000`). Your browser should now send its GET request messages to your server, and your server should display the messages on its standard output.

Regarding your question about whether the browser generates conditional GET messages for objects that are locally cached, I'm not sure. It would depend on the specific browser and its caching behavior.