Internal Server Error

The server has either erred or is incapable of performing the requested operation.

Traceback (most recent call last):
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webapp2-2.5.2/webapp2.py", line 1546, in __call__
    return response(environ, start_response)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/third_party/webob-1.1.1/webob/response.py", line 939, in __call__
    start_response(self.status, headerlist)
  File "/base/alloc/tmpfs/dynamic_runtimes/python27g/25fef2553b936881/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 198, in _StartResponse
    (_GetTypeName(value), value, name))
InvalidResponseError: header values must be str, got 'unicode' (u'https://pinnshop.com/product-category/sewing-machine-brother/01-sewing-machine/') for 'Location'