python wsgi教程3——响应

将上一个例子的返回:


return [response_body]

改为:


return response_body

再次运行会发现速度变慢了。这是因此服务器对发送过来的字符串是按单个字节进行迭代的,所以最好对返回的字符串用一个可迭代对象包装一下。


如果返回的这个可迭代对象生成多个字符串,那么正文的长度即为这些字符串长度的总和。


接下来看一个例子:

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#! /usr/bin/env python
from wsgiref.simple_server import make_server
def application(environ, start_response):
response_body = ['%s: %s' % (key, value)
for key, value in sorted(environ.items())]
response_body = '\n'.join(response_body)
# Response_body has now more than one string
response_body = ['The Beggining\n',
'*' * 30 + '\n',
response_body,
'\n' + '*' * 30 ,
'\nThe End']
# So the content-lenght is the sum of all string's lengths
content_length = 0
for s in response_body:
content_length += len(s)
status = '200 OK'
response_headers = [('Content-Type', 'text/plain'),
('Content-Length', str(content_length))]
start_response(status, response_headers)
return response_body
httpd = make_server('localhost', 8051, application)
httpd.handle_request()