python中WSGI的工作原理

from wsgiref.util import setup_testing_defaults

from wsgiref.simple_server import make_server

# A relatively simple WSGI application. It's going to print out the

# environment dictionary after being updated by setup_testing_defaults

#############################################################

#主要给app传递environ和start_response函数

#############################################################

def simple_app(environ, start_response):

    setup_testing_defaults(environ)

    status = '200 OK'

    headers = [('Content-type', 'text/plain; charset=utf-8')]

    start_response(status, headers)

    ret = [("%s: %s\n" % (key, value)).encode("utf-8")

           for key, value in environ.items()]

    return ret

httpd = make_server('', 8000, simple_app)

print("Serving on port 8000...")

httpd.serve_forever()