标签:style http color os 文件 width
WSGI 是Web Services Gateway Interface的缩写. 如果想深入了解,可以阅读 PEP 333 文档,包含有任何你想要的:)community errata, .这篇文章将手把手教你写一个简单的WSGI例子。
注意:我用的Python版本是.2.7.x.
最经典,最简答的WSGI样当属 Hello World app.
咱们将要用到 virtualenv 去创建一个封闭的Python项目环境:
$
virtualenv wsgi-example $
cd wsgi-example $
source bin/activate |
然后在该目录下新建一个文件: wsgi_app.py 并且添加如下的代码 :
from
__future__ import
print_function from
wsgiref.simple_server import
make_server def
myapp(environ, start_response): response_headers
=
[( ‘content-type‘ ,
‘text/plain‘ )] start_response( ‘200
OK‘ ,
response_headers) return
[ ‘Hello
World‘ ] app
=
myapp httpd
=
make_server(‘‘, 8080 ,
app) print ( "Starting
the server on port 8080" ) httpd.serve_forever() |
把项目跑起来:
$
python wsgi_app.py |
之后就可以测试啦,测试有浏览器或者命令cURL两种方式,返回的应该是hello world 哦:
$
curl http://localhost:8080 -v |
上面这个例子虽然清晰,但是一点都不爽啊so easy。let‘s high 起来。接下来我们继续往里面赛一条消息 。
修改 wsgi_app.py 文件成下面这个样纸:
from
__future__ import
print_function from
wsgiref.simple_server import
make_server from
urlparse import
parse_qs def
myapp(environ, start_response): msg
=
‘No Message!‘ response_headers
=
[( ‘content-type‘ ,
‘text/plain‘ )] start_response( ‘200
OK‘ ,
response_headers) qs_params
=
parse_qs(environ.get( ‘QUERY_STRING‘ )) if
‘msg‘
in
qs_params: msg
=
qs_params.get( ‘msg‘ )[ 0 ] return
[ ‘Your
message was: {}‘ . format (msg)] app
=
myapp httpd
=
make_server(‘‘, 8080 ,
app) print ( "Starting
the server on port 8080" ) httpd.serve_forever() |
把程序跑起来,测试还是刚才那样。如果程序还在运行中,可以CTRL+C快捷键暂停并且重启。
$
curl http://localhost:8080/?msg=Hello -v |
接下来,让我们继续聊中间件。你可以在这里 获得一些信息。这里我会写一个添加了HTTP 头回复的中间层例子。中间件可以做任何你能够想象的到的事情,例如session,认证等等。
中间件例子:
from
__future__ import
print_function from
wsgiref.simple_server import
make_server def
myapp(environ, start_response): response_headers
=
[( ‘content-type‘ ,
‘text/plain‘ )] start_response( ‘200
OK‘ ,
response_headers) return
[ ‘Check
the headers!‘ ] class
Middleware: def
__init__( self ,
app): self .wrapped_app
=
app def
__call__( self ,
environ, start_response): def
custom_start_response(status, headers, exc_info = None ): headers.append(( ‘X-A-SIMPLE-TOKEN‘ ,
"1234567890" )) return
start_response(status, headers, exc_info) return
self .wrapped_app(environ,
custom_start_response) app
=
Middleware(myapp) httpd
=
make_server(‘‘, 8080 ,
app) print ( "Starting
the server on port 8080" ) httpd.serve_forever() |
访问终端:
$
curl http://localhost:8080/ -v |
结果差不多应该是介个样子的:
*
Connected to localhost (127.0.0.1) port 8080 (#0) >
GET / HTTP/1.1 >
User-Agent: curl/7.30.0 >
Host: localhost:8080 >
Accept: */* >
*
HTTP 1.0, assume close after body <
HTTP/1.0 200 OK <
Date: Sat, 08 Feb 2014 00:16:00 GMT <
Server: WSGIServer/0.1 Python/2.7.5 <
content-type: text/plain <
X-A-SIMPLE-TOKEN: 1234567890 <
Content-Length: 18 <
*
Closing connection 0 |
(四)Openstack学习之WSGI:自己动手写例子,码迷,mamicode.com
标签:style http color os 文件 width
原文地址:http://blog.csdn.net/alvine008/article/details/24720451