timeapp_raw.py

#!/usr/bin/env python3
# Foundations of Python Network Programming, Third Edition
# https://github.com/brandon-rhodes/fopnp/blob/m/py3/chapter10/timeapp_raw.py
# A simple HTTP service built directly against the low-level WSGI spec.

import time

def app(environ, start_response):
    host = environ.get('HTTP_HOST', '127.0.0.1')
    path = environ.get('PATH_INFO', '/')
    if ':' in host:
        host, port = host.split(':', 1)
    if '?' in path:
        path, query = path.split('?', 1)
    headers = [('Content-Type', 'text/plain; charset=utf-8')]
    if environ['REQUEST_METHOD'] != 'GET':
        start_response('501 Not Implemented', headers)
        yield b'501 Not Implemented'
    elif host != '127.0.0.1' or path != '/':
        start_response('404 Not Found', headers)
        yield b'404 Not Found'
    else:
        start_response('200 OK', headers)
        yield time.ctime().encode('ascii')