由于各种PYTHON框架都实现了WSGI接口，所以，通用性很广的。
在调试过程过，有一个字母拼错，搞了一个小时。
看来PYTHON自带的编辑器没有高亮，不爽。
在有提示的编辑器里一看就看了来啦。。：）
webserver.py
import socket import StringIO import sys class WSGIServer(object): address_family = socket.AF_INET socket_type = socket.SOCK_STREAM request_queue_size = 1 def __init__(self, server_address): # Create a listening socket self.listen_socket = listen_socket = socket.socket( self.address_family, self.socket_type ) # Allow to reuse the same address listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) # Bind listen_socket.bind(server_address) # Active listen_socket.listen(self.request_queue_size) # Get server host name and port host, port = self.listen_socket.getsockname()[0:2] self.server_name = socket.getfqdn(host) self.server_port = port # Return headers set by web framework/Web application self.headers_set = [] def set_app(self, application): self.application = application def serve_forever(self): listen_socket = self.listen_socket while True: # New client connection self.client_connection, client_address = listen_socket.accept() # Handle one request and close the client connection. Then # loop over to wait for another client connection self.handle_one_request() def handle_one_request(self): self.request_data = request_data = self.client_connection.recv(1024) # Print formatted request data a la 'curl -v' print(''.join( '< {line} \n'.format(line=line) for line in request_data.splitlines() )) self.parse_request(request_data) # Construct environment dictionary using requst data env = self.get_environ() # It's time to call our application callable and get # back a result that will become HTTP response body print 'self.application: ********************', self.application result = self.application(env, self.start_response) # Construct a response and send it back to the client self.finish_response(result) def parse_request(self, text): request_line = text.splitlines()[0] request_line = request_line.rstrip('\r\n') # Break down the request line into components (self.request_method, #GET self.path, #/hello self.request_version # HTTP/1.1 ) = request_line.split() def get_environ(self): env = {} # The following code snippet does not follow PEP8 conventions # but it's formatted the way it is for demonstration purposes # to emphasize the required variables and their values # # Required WSGI variables env['wsgi.version'] = (1, 0) env['wsgi.url_scheme'] = 'http' env['wsgi.input'] = StringIO.StringIO(self.request_data) env['wsgi.errors'] = sys.stderr env['wsgi.multithread'] = False env['wsgi.multiprocess'] = False env['wsgi.run_once'] = False # Required CGI variables env['REQUEST_METHOD'] = self.request_method # GET env['PATH_INFO'] = self.path # /hello env['SERVER_NAME'] = self.server_name # localhost env['SERVER_PORT'] = str(self.server_port) # 8888 return env def start_response(self, status, response_headers, exc_onfo=None): # Add necessary server headers server_headers = [ ('Date', 'Tue, 31 Mar 2015 12:54:48 GMT'), ('Server', 'WSGIServer 02'), ] self.headers_set = [status, response_headers + server_headers] # To adhere to WSGI specification the start_response must return # a 'write' callable. We simplicity's sake we'll ignore that detail # for now. # return self.finish_response def finish_response(self, result): try: status, response_headers = self.headers_set response = 'HTTP/1.1 {status}\r\n'.format(status=status) for header in response_headers: response += '{0}: {1}\r\n'.format(*header) response += '\r\n' for data in result: response += data # Print formatted response data a la 'curl -v' print(''.join( '> {line}\n'.format(line=line) for line in response.splitlines() )) self.client_connection.sendall(response) finally: self.client_connection.close() SERVER_ADDRESS = (HOST, PORT) = '', 8888 def make_server(server_address, application): server = WSGIServer(server_address) server.set_app(application) return server if __name__ == '__main__': if len(sys.argv) < 2: sys.exit('Provide a WSGI application object as module:callable') app_path = sys.argv[1] module, application = app_path.split(':') module = __import__(module) application = getattr(module, application) httpd = make_server(SERVER_ADDRESS, application) httpd.serve_forever() print("WSGIServer: Serving HTTP on port {port}...\n".format(port=PORT))
wsgiapp.py
def app(environ, start_response): """ A barebones WSGI application. This is a starting point for you own Web Framework :) """ status = '200 OK' response_headers = [('Content-Type', 'text/plain')] start_response(status, response_headers) return ['Hello world from a simple WSGI application!\n']
运行命令：
python webserver.py wsgiapp:app
结果：
