对有多个域名的或换域名的网站很有用，python 框架里较底层的转向，对遵循WSGI规范的环境均有效。
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from urlparse import urlunsplit
application = Application()
def redirect_to_major_domain(wsgi_app, major_domain, ignore_scheme=False):
def redirect_if_needed(env, start_response):
if env['HTTP_HOST'] != major_domain and env['REMOTE_ADDR'][:2] != '0.' and (ignore_scheme or env['wsgi.url_scheme'] == 'http'):
url = urlunsplit(['http', major_domain, env['PATH_INFO'], env['QUERY_STRING'], ''])
start_response('301 Moved Permanently', [('Location', url)])
return []
else:
return wsgi_app(env, start_response)
return redirect_if_needed
application = redirect_to_major_domain(application, MAJOR_DOMAIN)
但有个情况不能使用，在vps 上用nginx 反向代理到一个sinaapp.com 的二级域名，BAE 的没试过。