Django Invalid HTTP_HOST header: 'testserver'. You may need to add u'testserver' to ALLOWED_HOSTS

Question

I started learning Django, I'm in the middle of implementing "Test a view" functionality. When I use test Client in the shell, the exception has occurred as follows.

Invalid HTTP_HOST header: 'testserver'. You may need to add u'testserver' to ALLOWED_HOSTS.

I run the command in the shell as follows.

>>> from django.test.utils import setup_test_environment >>> setup_test_environment() >>> from django.test import Client >>> client = Client() >>> response = client.get('/') >>> response.status_code 400 

In the tutorial, 404 should be appeared, but I get 400. When I continue running the command as follows, same exception has occurred.

>>> response = client.get(reverse('polls:index')) >>> response.status_code 400 

but the result must be 200.I guess I should declare ALLOWED_HOSTS in the settings.py, but how can I? I run the server on localhost using $python manage.py runserver.

I wanna know the reason and solution.

Here is settings.py as follows.

import os BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) SECRET_KEY = '8v57o6wyupthi^#41_yfg4vsx6s($1$x0xmu*95_u93wwy0_&u' DEBUG = True ALLOWED_HOSTS = [127.0.0.1,'localhost'] INSTALLED_APPS = [     'django.contrib.admin',     'django.contrib.auth',     'django.contrib.contenttypes',     'django.contrib.sessions',     'django.contrib.messages',     'django.contrib.staticfiles',     'polls', ] ....    (MIDDLEWARE) ROOT_URLCONF = 'tutorial.urls'  TEMPLATES = [     {         'BACKEND': 'django.template.backends.django.DjangoTemplates',         'DIRS': [],         'APP_DIRS': True,         'OPTIONS': {             'context_processors': [                 'django.template.context_processors.debug',                 'django.template.context_processors.request',                 'django.contrib.auth.context_processors.auth',                 'django.contrib.messages.context_processors.messages',             ],         },     }, ]  WSGI_APPLICATION = 'tutorial.wsgi.application' ....    (DATABASES, AUTH_PASSWORD_VALIDATORS) LANGUAGE_CODE = 'en-us'  TIME_ZONE = 'UTC'  USE_I18N = True  USE_L10N = True  USE_TZ = True 

Answer 1

Edit the following line in your settings.py file:

ALLOWED_HOSTS = ['127.0.0.1', 'localhost'] 

Restart your server afterwards