This problem occurs when participants attempt to view a document.

treconomics.py

Environment:


Request Method: GET
Request URL: http://ede1a05.ngrok.com/treconomics/391485/

Django Version: 1.7
Python Version: 2.7.10
Installed Applications:
('django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.staticfiles',
 'django.contrib.admin',
 'treconomics',
 'survey',
 'search')
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware')


Traceback:
File "/Users/mickeypash/.virtualenvs/treconomics3-dev/lib/python2.7/site-packages/django/core/handlers/base.py" in get_response
  204.                 response = middleware_method(request, response)
File "/Users/mickeypash/.virtualenvs/treconomics3-dev/lib/python2.7/site-packages/django/contrib/sessions/middleware.py" in process_response
  30.                 patch_vary_headers(response, ('Cookie',))
File "/Users/mickeypash/.virtualenvs/treconomics3-dev/lib/python2.7/site-packages/django/utils/cache.py" in patch_vary_headers
  148.     if response.has_header('Vary'):

Exception Type: AttributeError at /treconomics/391485/
Exception Value: 'str' object has no attribute 'has_header'

Pls, have you found solution to this error after six years

For anyone with a similiar problem, check your view.

I got the 'str' object has no attribute 'has_header' error message because my view returned a string instead of a HttpResponse object.

^ That's right