WSGI 在 python 中的工作原理

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()