ImportError: Module "django.middleware.common" does not define a "CorsMiddleware" attribute/class

[santhoshdc1590]

Anyone tell me what is happening here? How do I correct this?

Python 3.5

pip installed

django==1.11.1
djangorestframework==3.8.2
django-cors-headers==2.2.0

This is my settings.py

"""
Django settings for mysite project.

Generated by 'django-admin startproject' using Django 1.11.1.

For more information on this file, see
https://docs.djangoproject.com/en/1.11/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/1.11/ref/settings/
"""

import os
from corsheaders.defaults import default_methods
from corsheaders.defaults import default_headers
# Build paths inside the project like this: os.path.join(BASE_DIR, ...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/1.11/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '1+fkbb#o$j3&2xc=90k(cn^^41$^=5$w9#3-3frm2y4cz$%2qy'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = ['*']


# Application definition

INSTALLED_APPS = [
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'mysite.myapp',
    'corsheaders',
]

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.common.CorsMiddleware',
]

ROOT_URLCONF = 'mysite.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',
            ],
        },
    },
]

MIDDLEWARE_CLASSES = [
   
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'corsheaders.middleware.CorsPostCsrfMiddleware',
]

WSGI_APPLICATION = 'mysite.wsgi.application'

CORS_ALLOW_METHODS = default_methods + (
    'POKE',
)

CORS_ALLOW_HEADERS = default_headers + (
    'my-custom-header',
)

# Database
# https://docs.djangoproject.com/en/1.11/ref/settings/#databases

DATABASES = {}

# Password validation
# https://docs.djangoproject.com/en/1.11/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = []

CORS_ORIGIN_ALLOW_ALL = True
# Internationalization
# https://docs.djangoproject.com/en/1.11/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True

# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/1.11/howto/static-files/

STATIC_URL = '/static/'

This is the Traceback I'm getting

Failed to execute script function Traceback (most recent call last):
File "site-packages/django/utils/module_loading.py",
line 23, in import_string AttributeError: module 'django.middleware.common' has no attribute 'CorsMiddleware'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "function.py", line 2, in File "/app/cloudfn/pip-cache-3.5/lib/python3.5/site-packages/PyInstaller/loader/pyimod03_importers.py",
line 631, in exec_module File "mysite/wsgi.py",
line 16, in File "site-packages/django/core/wsgi.py",
line 14, in get_wsgi_application File "site-packages/django/core/handlers/wsgi.py",
line 151, in init File "site-packages/django/core/handlers/base.py",
line 80, in load_middleware File "site-packages/django/utils/module_loading.py",
line 27, in import_string File "site-packages/django/utils/six.py",
line 685, in reraise File "site-packages/django/utils/module_loading.py",
line 23, in import_string ImportError: Module "django.middleware.common" does not define a "CorsMiddleware" attribute/class

[adamchainz]

The error is that you've added the path django.middleware.common.CorsMiddleware to your MIDDLEWARE setting, and this doesn't exist. The error message is pretty clear I think! Probably some copy/paste mistakes, this library provides corsheaders.middleware.CorsMiddleware which you have in there correctly, and django.middleware.common.CommonMiddleware is one of Django's built-ins: https://docs.djangoproject.com/en/2.0/topics/http/middleware/ .

Also your settings has both MIDDLEWARE and MIDDLEWARE_CLASSES, MIDDLEWARE is the new one from later versions of Django and MIDDLEWARE_CLASSES will be ignored, you should remove it and make sure you have everything you need in MIDDLEWARE, e.g. the csrf and cors-post middlewares.

HTH

[santhoshdc1590]

@adamchainz Thank You for the MIDDLEWARE and MIDDLEWARE_CLASSES. Removing the django.middleware.common.CorsMiddleware from MIDDLEWARE did help.

I have django-cors-headers==2.2.0 installed. I am still having this error

Failed to execute script function Traceback (most recent call last):
File "function.py", line 2, in
File "/app/cloudfn/pip-cache-3.5/lib/python3.5/site-packages/PyInstaller/loader/pyimod03_importers.py",
line 631, in exec_module File "mysite/wsgi.py",
line 16, in File "site-packages/django/core/wsgi.py",
ine 14, in get_wsgi_application File "site-packages/django/core/handlers/wsgi.py",
line 151, in init File "site-packages/django/core/handlers/base.py",
line 80, in load_middleware File "site-packages/django/utils/module_loading.py",
line 20, in import_string File "importlib/init.py",
line 126, in import_module ImportError: No module named 'corsheaders.middleware'

[adamchainz]

The import failure indicates it's not actually installed. Perhaps you are mixing up python environments.

[santhoshdc1590]

This is my requirements.txt

django==1.11.1
djangorestframework==3.8.2
django-cors-headers==2.2.0
altgraph==0.15
cachetools==2.0.1
certifi==2018.1.18
chardet==3.0.4
Django==1.11.1
future==0.16.0
google-auth==1.4.1
idna==2.6
Jinja2==2.10
jsonpickle==0.9.6
macholib==1.9
MarkupSafe==1.0
numpy==1.14.2
opencv-python==3.3.0.9
pefile==2017.11.5
pyasn1==0.4.2
pyasn1-modules==0.2.1
pycloudfn==0.1.209
PyInstaller==3.3.1
pyspin==1.1.1
python-dateutil==2.6.0
pytz==2018.3
requests==2.18.4
rsa==3.4.2
scipy==1.0.1
six==1.10.0
urllib3==1.22
Werkzeug==0.12
google-cloud==0.32.0

[adamchainz]

I'm sorry, I don't think I can help you any further.

[santhoshdc1590]

@adamchainz Thank You