Python Hello,World Web Server

server.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from http.server import HTTPServer
from http.server import BaseHTTPRequestHandler
from http import HTTPStatus

class MyHandler(BaseHTTPRequestHandler):

    def do_GET(self):
        self.send_response(HTTPStatus.OK)
        self.send_header('Content-type', 'text/html')
        self.end_headers()
        self.wfile.write(b'Hello, Python!')
        return


def run(server_class=HTTPServer, handler_class=MyHandler):
    server_address = ('localhost', 8000)
    httpd = server_class(server_address, handler_class)
    try:
        print("Server works on http://localhost:8000")
        httpd.serve_forever()
    except KeyboardInterrupt:
        print("Stop the server on http://localhost:8000")
        httpd.socket.close()


if __name__ == '__main__':
    run()

BaseHTTPRequestHandler中关于响应的说明如下：

This server parses the request and the headers, and then calls a
function specific to the request type (). Specifically,
a request SPAM will be handled by a method do_SPAM(). If no
such method exists the server sends an error response to the
client. If it exists, it is called with no arguments: do_SPAM()
Note that the request name is case sensitive (i.e. SPAM and spam are different requests).

The various request details are stored in instance variables:

• client_address is the client IP address in the form (host,port);
• command, path and version are the broken-down request line;
• headers is an instance of email.message.Message (or a derived class) containing the header information;
• rfile is a file object open for reading positioned at the start of the optional input data part;
• wfile is a file object open for writing.

IT IS IMPORTANT TO ADHERE TO THE PROTOCOL FOR WRITING!
The first thing to be written must be the response line. Then follow 0 or more header lines, then a blank line, and then the actual data (if any). The meaning of the header lines depends on the command executed by the server; in most cases, when data is returned, there should be at least one header line of the form

Content-type: <type>/<subtype>
# where <type> and <subtype> should be registered MIME types, e.g. "text/html" or "text/plain".

Looks pretty simple 👍

Thanks! that helped me understand localhost pretty well