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I am trying to make a python web server with the Socket module. I am following this video https://www.youtube.com/watch?v=_najJkyK46g.

This is my code:

import socket

host = ''
port = 8000

listen_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
listen_socket.bind((host, port))
listen_socket.listen(1)

print("Listening on port "+str(port))

while True:
    client_connection, client_address = listen_socket.accept()
    request = client_connection.recv(1024)
    print(request)

    http_response = "Hello World."

    client_connection.sendall(bytes(http_response.encode('utf-8')))
    client_connection.close()

When I go to chrome and enter 127.0.0.1:8000 it doesn't work. It brings up an error saying "This page isn't working". 127.0.0.1 sent an invalid response. ERR_INVALID_HTTP_RESPONSE. Please help me?

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2

Chrome is expecting an HTTP response which is a structured protocol, which Hello World. doesn't comply with:

https://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol#Response_message

The response message consists of the following:

A status line which includes the status code and reason message (e.g., HTTP/1.1 200 OK, which indicates that the client's request succeeded). Response header fields (e.g., Content-Type: text/html). An empty line. An optional message body. The status line and other header fields must all end with . The empty line must consist of only and no other whitespace.[31] This strict requirement for is relaxed somewhat within message bodies for consistent use of other system linebreaks such as or alone.[33]

Updating to the following response should work:

HTTP/1.1 200 OK
Date: Mon, 23 May 2005 22:38:34 GMT
Content-Type: text/html; charset=UTF-8
Content-Encoding: UTF-8
Content-Length: 138
Last-Modified: Wed, 08 Jan 2003 23:11:55 GMT
Server: Apache/1.3.3.7 (Unix) (Red-Hat/Linux)
ETag: "3f80f-1b6-3e1cb03b"
Accept-Ranges: bytes
Connection: close

<html>
<head>
  <title>An Example Page</title>
</head>
<body>
  Hello World, this is a very simple HTML document.
</body>
</html>

If you're going to be making a server to communicate over HTTP I would def recommend a python web http framework, of which there are many. Two very light weight ones being:

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  • So I'm confused. Do you want me to add that HTML to the python script? That's not possible, right? Could we just do this with one language?
    – user9091807
    Commented Dec 13, 2017 at 3:12