In [1]:

import socket
listen_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
listen_socket.bind(('127.0.0.1', 0))
listen_socket.getsockname()

Out[1]:

('127.0.0.1', 54805)

In [3]:

listen_socket.listen(1)

accept waits until a connection is established from the other side (a .connect() call)

In [20]:

connection, address = listen_socket.accept()

recv waits until there is data to recv from the connection (e.g. a .send)

In [21]:

request = connection.recv(1024)

In [18]:

print(request.decode())

HTTP/1.1 GET /somepage

Now we can send the reply and close the connection because we are done

In [22]:

connection.sendall(b"""HTTP/1.1 200 OK
Content-type: text/html

<html>
<body>
<h1> hello, world </h1>
</body>
</html>
""")
connection.close()

Wrapping this all in a single function that handles a complete request

In [13]:

def handle_request(sock):
    connection, address = sock.accept()
    request = connection.recv(1024)
    print(request.decode())
    connection.sendall(b"""HTTP/1.1 200 OK
Content-type: text/html

<html>
<body>
<h1> hello, world </h1>
</body>
</html>
""")
    connection.close()

In [15]:

handle_request(listen_socket)

GET / HTTP/1.1
Host: 127.0.0.1:54805
Cookie: _xsrf=2|2c3b26c1|3a353a3e15e26f29dc2989f4176dd739|1537274238; username-127-0-0-1-62692="2|1:0|10:1537274238|24:username-127-0-0-1-62692|44:MGQzYWVmYjg1YTdiNDgwMmJiMmNjMTlhNjUzODM3N2M=|d2790faa1308b5c019da742cb16d1bceadf3175d59cc4001d1a4cdcbf2f57da0"; _ga=GA1.1.1413211555.1475583612
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0 Safari/605.1.15
Accept-Language: en-us
DNT: 1
Accept-Encoding: gzip, deflate

In [ ]: