update check origin

Author: michaelliao

teach/learning.py

@@ -83,7 +83,7 @@ def application(environ, start_response):
     code = qs['code'][0]
     headers = [('Content-Type', 'application/json')]
     origin = environ.get('HTTP_ORIGIN', '')
-    if origin.find('www.liaoxuefeng.com') == -1:
+    if origin.find('.liaoxuefeng.com') == -1:
         start_response('400 Bad Request', [('Content-Type', 'application/json')])
         return [b'{"error":"invalid_origin"}']
     headers.append(('Access-Control-Allow-Origin', origin))