我正在尝试实现一个简单的烧瓶应用程序，它将向前端传递一个 json 文件，但出现如下错误：
> 127.0.0.1 - - [04/Oct/2016 17:53:02] "GET /test HTTP/1.1" 500 - Traceback (most recent call last): File
> "/Users/michelleshieh/anaconda2/lib/python2.7/site-packages/flask/app.py",
> line 2000, in __call__
> return self.wsgi_app(environ, start_response) File "/Users/michelleshieh/anaconda2/lib/python2.7/site-packages/flask/app.py",
> line 1992, in wsgi_app
> return response(environ, start_response) File "/Users/michelleshieh/anaconda2/lib/python2.7/site-packages/werkzeug/wrappers.py",
> line 1228, in __call__
> app_iter, status, headers = self.get_wsgi_response(environ) File "/Users/michelleshieh/anaconda2/lib/python2.7/site-packages/werkzeug/wrappers.py",
> line 1216, in get_wsgi_response
> headers = self.get_wsgi_headers(environ) File "/Users/michelleshieh/anaconda2/lib/python2.7/site-packages/werkzeug/wrappers.py",
> line 1167, in get_wsgi_headers
> for x in self.response) File "/Users/michelleshieh/anaconda2/lib/python2.7/site-packages/werkzeug/wrappers.py", …