Maintaining Connections on a HTTP proxy in python

Question

    import main
    import socket, sys, os, _thread

    def proxy_setup(port):

    #port number
    host = ''   #proxy will run on localhost

    print("Proxy server running on ", host, ":", port)                                     

    try:
        #socket creation and host and port binding
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.bind((host, port))
        s.listen(main.BACKLOG)
    
    except socket.error as e:
        (value, message) = e.args
        if s:
            s.close()
        print(message)
        sys.exit(1)

    while 1:
        s.listen(2)
        conn, client_addr = s.accept()
        print(conn)
        #IP = str(input("Please enter your chosen IP: "))
        _thread.start_new_thread(proxy_thread, (conn, client_addr))

    s.close()

def output(type,request,address):

    if "Block" in type or "Blacklist" in type:
        colornum = 91
    elif "Request" in type:
        colornum = 92
    elif "Reset" in type:
        colornum = 93

    print("\033[",colornum,"m",address[0],"\t",type,"\t",request,"\033[0m")

def proxy_thread(conn, client_addr):

    #load_balancer()
    # get the request from browser

    request = conn.recv(main.MAX_DATA_RECV)
    #print(request)
    # parse the first line
    first_line = request.split(b'\n')[0]

    # get url
    url = first_line.split(b' ')[1]


    output("Request",first_line,client_addr)
    # print "URL:",url
    # print

    # find the webserver and port
    http_pos = url.find(b"://")          # find pos of ://
    if (http_pos==-1):
        temp = url
    else:
        temp = url[(http_pos+3):]       # get the rest of url

    port_pos = temp.find(b":")           # find the port pos (if any)

    # find end of web server
    webserver_pos = temp.find(b"/")
    if webserver_pos == -1:
        webserver_pos = len(temp)

    webserver = ""
    port = -1
    if (port_pos==-1 or webserver_pos < port_pos):      # default port
        port = 80
        webserver = temp[:webserver_pos]
    else:       # specific port
        port = int((temp[(port_pos+1):])[:webserver_pos-port_pos-1])
        webserver = temp[:port_pos]
    try:
        # create a socket to connect to the web server
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.bind(("192.168.1.198", 0))
        s.connect((webserver, port))
        s.send(request)         # send request to webserver

        while 1:
            # receive data from web server
            data = s.recv(main.MAX_DATA_RECV)
        if (len(data) > 0):
            # send to browser
            conn.send(data)
        else:
            break
    #s.close()
    #conn.close()

except socket.error as e:
    (value, message) = e.args
    if s:
        s.close()
    if conn:
        conn.close()
    output("Peer Reset",first_line,client_addr)
    sys.exit(1)

I am trying to maintain a http connection when it goes through my web proxy. Currently, every time something from the same url is requested, it uses a new connection. Any idea how I can reuse the same connection if the request comes from a url that's already been requested. I have looked at HTTPConnectionPool but I am not sure how I would implement that here. I use this proxy by redirecting my browser to the localhost and whatever port the proxy is on.