Python web.py图片与css文件访问遇到500错误怎么解决，,使用了StaticMid

Python web.py图片与css文件访问遇到500错误怎么解决，,使用了StaticMid

使用了StaticMiddleware ，Static目录下css和图片文件访问500错误，报错如下

Traceback (most recent call last):  File "D:\python 2.7.7\lib\site-packages\web\wsgiserver\__init__.py", line 1245, in communicate    req.respond()  File "D:\python 2.7.7\lib\site-packages\web\wsgiserver\__init__.py", line 775, in respond    self.server.gateway(self).respond()  File "D:\python 2.7.7\lib\site-packages\web\wsgiserver\__init__.py", line 2020, in respond    for chunk in response:  File "D:\python 2.7.7\lib\site-packages\web\httpserver.py", line 247, in __iter__    self.start_response(self.status, self.headers)  File "D:\python 2.7.7\lib\site-packages\web\httpserver.py", line 302, in xstart_response    out = start_response(status, response_headers, *args)  File "D:\python 2.7.7\lib\site-packages\web\wsgiserver\__init__.py", line 2058, in start_response    raise TypeError("WSGI response header value %r is not a byte string." % v)TypeError: WSGI response header value u'text/css' is not a byte string.

代码是参照这里：
https://github.com/the5fire/backbonejs-learning-note/blob/master/chapters/10-expand-todos-with-server.rst

后面加上了StaticMiddleware，依然无效

from web.httpserver import StaticMiddlewareapp = web.application(urls, globals())application = app.wsgifunc(StaticMiddleware)

编橙之家文章，