WSGI 程序 起步

本文地址：http://blog.csdn.net/spch2008/article/details/8997579

本文中程序的放置路径及运行方式在 Window + Apache + WSGI 配置指明。

第一WSGI程序

def spch_wsgi(environ, start_response):      status = '200 OK'    response_headers = [('Content-Type', 'text/plain')]    start_response(status, response_headers)    return ['Hello World!']application = spch_wsgi

WSGI server检索application函数， 并传递两个参数environ， start_response。

environ 为一个字典，包含环境变量。

start_response 为一个函数， 用于返回状态信息。

一个WSGI程序要完成两件事：

     其一：返回HTTP header。本例中， 状态‘200 OK‘， 表明一切正常。

     其二：返回一个iterable containing， 本例中是一个list。

输出environ信息

def application(environ, start_response):response_body = ""for k in environ:tmp = "%s = %s \n" % (k, environ[k])response_body += tmpstatus = '200 OK'response_headers = [('Content-Type', 'text/plain')]start_response(status, response_headers)return [response_body]

wsgi.multiprocess = False SERVER_PROTOCOL = HTTP/1.1 SERVER_SOFTWARE = Apache/2.2.22 (Win32) mod_wsgi/3.3 Python/2.7.4 SCRIPT_NAME = /wsgi mod_wsgi.handler_script =  SERVER_SIGNATURE =  REQUEST_METHOD = GET PATH_INFO =  PATHEXT = .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC QUERY_STRING =  HTTP_USER_AGENT = Mozilla/5.0 (Windows NT 6.2; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0 HTTP_CONNECTION = keep-alive SERVER_NAME = localhost REMOTE_ADDR = 127.0.0.1 mod_wsgi.request_handler = wsgi-script wsgi.url_scheme = http mod_wsgi.callable_object = application SERVER_PORT = 80 mod_wsgi.version = (3, 3) mod_wsgi.input_chunked = 0 SERVER_ADDR = 127.0.0.1 DOCUMENT_ROOT = D:/Program Files (x86)/Apache Software Foundation/Apache2.2/htdocs mod_wsgi.process_group =  COMSPEC = C:\Windows\system32\cmd.exe SCRIPT_FILENAME = C:/wsgi_app/wsgi_handler.py SERVER_ADMIN = [e-mail] wsgi.input = <mod_wsgi.Input object at 0x01379DE0> HTTP_HOST = localhost wsgi.multithread = True SystemRoot = C:\Windows REQUEST_URI = /wsgi HTTP_ACCEPT = text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 WINDIR = C:\Windows wsgi.version = (1, 1) GATEWAY_INTERFACE = CGI/1.1 wsgi.run_once = False wsgi.errors = <mod_wsgi.Log object at 0x01379D40> REMOTE_PORT = 64214 HTTP_ACCEPT_LANGUAGE = zh-cn,zh;q=0.8,en-us;q=0.5,en;q=0.3 mod_wsgi.application_group = 192.168.209.1|/wsgi mod_wsgi.script_reloading = 1 wsgi.file_wrapper = <built-in method file_wrapper of mod_wsgi.Adapter object at 0x012E1770> HTTP_ACCEPT_ENCODING = gzip, deflate 

上述代码也可以通过类来实现，类中要重载__call__，这样的好处是可以从其它类继承，复用代码。

class MyApp:    def __call__(self, environ, start_response):        response_body = ['Hello World!']         status = '200 OK'        response_headers = [('Content-Type', 'text/plain')]        start_response(status, response_headers)        return response_bodyapplication = MyApp()