wsgiref Module

The wsgiref module provides reference implementations and utilities for WSGI (Web Server Gateway Interface) servers and applications.

Complexity Reference

Operation	Time	Space	Notes
Server setup	O(1)	O(1)	Create server; single-threaded by default
Handle request	O(n)	O(n)	n = request/response size

WSGI Server Implementation

Simple WSGI Application

from wsgiref.simple_server import make_server

def application(environ, start_response):
    """WSGI application - O(1)"""
    path = environ.get('PATH_INFO', '')

    if path == '/':
        response_body = b'Hello, World!'
        status = '200 OK'
    else:
        response_body = b'Not Found'
        status = '404 Not Found'

    response_headers = [
        ('Content-Type', 'text/plain'),
        ('Content-Length', str(len(response_body)))
    ]
    start_response(status, response_headers)
    return [response_body]

# Create server - O(1)
httpd = make_server('localhost', 8000, application)

# Serve - O(m)
print("Serving at http://localhost:8000")
httpd.serve_forever()

Related Documentation

• http.server Module
• urllib Module