from socket import socket, AF_INET, SOCK_STREAM, SOL_SOCKET, SO_REUSEADDR, SHUT_WR
import sys

# Create a server socket, bind it to a port and start listening
tcpSerSock = socket(AF_INET, SOCK_STREAM)
tcpSerPort=12002
# Assign IP address and port number to socket
tcpSerSock.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
tcpSerSock.bind(('', tcpSerPort))
tcpSerSock.listen(1)
print ("listening on port %s" % tcpSerPort)
while 1:
    # Start receiving data from the client
    print ('Ready to serve...')
    tcpCliSock, addr = tcpSerSock.accept()
    print ("Connection from %s port %s" % addr)
# Receive the GET request from the client and echo it back
    buffer = ''
    message = ""
    more = True
        #this is a simplified way to read the file that will not always 
        #work on a slow connection. It is better to parse the data, look
        #for the request type, find the end of the headers, check for
        #content-length bytes after the headers.
    headers = {}
    while more:
        buffer = buffer + tcpCliSock.recv(2048).decode()
        (all_headers, sep, post_data) = buffer.partition("\r\n\r\n")
        if sep != "": #found end of headers
            more = False
            lines = all_headers.split("\r\n")
            for line in lines:
                [key, sep, value] = line.partition(":")
                headers[key.upper()] = value
                print ("(header)", key.upper(), value)
            if "CONTENT-LENGTH" in headers:
                content_length = int(headers["CONTENT-LENGTH"])
                while len(post_data) < content_length:
                    post_data = post_data + tcpCliSock.recv(2048).decode()
                print ("POST DATA ", post_data)
    out='''\
HTTP/1.1 200 OK
Content-type:text/plain
Content-length: {0}

{1}'''.format(len(buffer), buffer)
    tcpCliSock.send(out.encode())
    # Close the client and the server sockets    
    tcpCliSock.shutdown(SHUT_WR)

tcpSerSock.close()