Django Python rest framework, No 'Access-Control-Allow-Origin' header is present on the requested resource in chrome, works in firefox

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I have researched and read quite a few Stackoverflow posts on the same issue. None have resolved my issue.

My problem is that I am getting the "...No 'Access-Control-Allow-Origin' header is present on the requested resource..." error in my console.

I am using:

Chrome Version 57.0.2987.133 Firefox Version 52.0.2

Python 2.7 Django 1.11a1

AngularJS

I am using MAMP to serve my front-end Angular stuff, and the django server for the backend stuff.

In my django settings I have included the cors middleware and tried both the whitelist approach and just setting all to true:

MIDDLEWARE = [

    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'corsheaders.middleware.CorsMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',

]

CORS_ORIGIN_ALLOW_ALL = True

On google chrome I still get this error:

localhost/:1 XMLHttpRequest cannot load {my endpoint url}. Redirect from {my endpoint url} to {my endpoint url with a } has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin {requesting url} is therefore not allowed access.

It works appropriately on Firefox, and I can't figure out why it won't work for google chrome. I haven't tried any other types of browsers. Any help will be very appreciated, thank you.

Install the cors-headers package with

pip install django-cors-headers

Adds to your installed apps

INSTALLED_APPS = [
    ...
    'corsheaders',
    ...
]

Add on your MIDDLEWARE remember to add as being the first in the list

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

Before installed apps put this configuration for anyone to access

CORS_ORIGIN_ALLOW_ALL=True

Or create a list of hits

CORS_ORIGIN_WHITELIST = [
    'http://google.com',
    'http://hostname.example.com',
    'http://localhost:8000',
    'http://127.0.0.1:9000'
]

Quickstart, In this tutorial, we'll develop a RESTful API with the Django Rest Framework. way, we'll be converting a non-RESTful application into a RESTful one with DRF. When using a virtual environment like virtualenv without having django-rest-framework installed globally you might as well have the error. The solution would be: activate the environment first with { {your environment name}}/bin/activate for Linux or { {your environment name}}/Scripts/activate for Windows and then run the command again.

Check your request url first.I had this problem when use vue-resource .And then find i missing '/' at the end or url.

Django Rest Framework – An Introduction – Real Python, Use Django REST to build your API with our step-by-step tutorial. We included code pieces, Serialization supports both ORM and non-ORM data sources. First of all, you have to install Python dependencies for your OS. If you're using� After the installation of django-rest-framework-condition python library, ModuleNotFoundError: No module named 'django-rest-framework-condition' error will be solved.

Make sure use 127.0.0.1 NOT localhost because when using localhost browser may look up an IPv6 address... or set up localhost to explicitly to 127.0.0.1 at /etc/hosts

Django REST API Development: Step-by step Tutorial, Django REST framework is a powerful and flexible toolkit for building Web APIs. Serialization that supports both ORM and non-ORM data sources. and only officially support the latest patch release of each Python and Django series. When using a virtual environment like virtualenv without having django-rest-framework installed globally you might as well have the error. The solution would be: activate the environment first with { {your environment name}}/bin/activate for Linux or { {your environment name}}/Scripts/activate for Windows and then run the command again.

Perhaps you need to take a look at how you are calling your middlewares. If they are not in the correct sequence they might throw this error. It seems like your 'django.middleware.security.SecurityMiddleware' needs to be pushed below the 'corsheaders.middleware.CorsMiddleware'. Also, it looks like you might have to add CORS_ALLOW_CREDENTIALS = True in your code as well.

Hope this helps.

djangorestframework � PyPI, Your project may not work properly until you apply the migrations for app(s): admin, auth, contenttypes, sessions. Run 'python manage.py migrate� There is currently no other way that using a third party app to create a REST API in Django. This is something not natively supported in Django. But Tastypie and Django Rest Framework are two very good third apps, there's nothing wrong to use them. They both have good documentation and there exists lots of posts talking about them.

the reason that is chrome browse; you can install CORS Toggle app in chrome or deploy your web code to nginx or apache then using chrome.

Build a REST API in 30 minutes with Django REST Framework, You need to install django rest framework using pip3 (pip for python 3): pip3 install djangorestframework. Instructions on how to install pip3 can� One of the main reasons behind the popularity of Django framework is the huge Django community. The community is so huge that a separate website was devoted to it where developers from all corners developed third-party packages including authentication, authorization, full-fledged Django powered CMS systems, e-commerce add-ons and so on.

Django Rest Framework -- no module named rest_framework , Django Rest Framework (DRF) Quick Start; Conclusion One of the key advantages here is being able to access data without having to be directly Take for example a service interacting with your API via the requests library in Python. Creating a basic Serializer. To create a basic serializer one needs to import serializers class from rest_framework and define fields for a serializer just like creating a form or model in Django.

How to build a Rest API with the Django REST Framework?, Django, API, REST, Django REST framework. Also note that packages required for both OAuth 1.0a, and OAuth 2.0 are not yet Python 3 compatible. Django is of the popular web development framework based on python having a large community and is used by many top websites presently. And Django Rest Framework, one of the most popular python…

Django REST framework - Web APIs for Django, Django REST API tutorial without DRF (Django REST Framework) | Django Tutorial | REST Duration: 25:50 Posted: Feb 18, 2018 Django REST marshmallow. The django-rest-marshmallow package provides an alternative implementation for serializers, using the python marshmallow library. It exposes the same API as the REST framework serializers, and can be used as a drop-in replacement in some use-cases. Serpy

Comments
  • I am having this problem too -- it works in FF but not Chrome. I have the corsheaders in my INSTALLED_APPS and the two lines mentioned in the MIDDLEWARE, and I've got CORS_ORIGIN_WHITELIST set to a list with 'localhost:8080' as the first item. I've also tried adding the following headers to the JSONResponse: def set_cors_headers(rsp: JSONResponse, method: str)->JSONResponse: rsp.__setitem__("Access-Control-Allow-Origin", "") rsp.__setitem__("Access-Control-Allow-Methods", method) rsp.__setitem__("Access-Control-Allow-Headers", "") return rsp
  • Did not work for me for django 2.1.4 and django-cors-headers 2.4.0 which are both the latest versions at the time of writing.
  • the question clearly states that he had installed cors-headers already and that the problem lies between Chrome and FF
  • Small correction, the last part should be with [ instead of (.
  • You must add "http://" for example as the error you'll give says: Origin 'localhost:3000' in CORS_ORIGIN_WHITELIST is missing scheme or netloc
  • as mentioned by @normic this is clearly not the proper answer to the question.
  • Had the same issue and this was the fix for me. See also this post from '15(!) for details: stackoverflow.com/a/33377351/5745325
  • This is the solution. Should be accepted as answer.
  • This is the solution for me at least in Angular 2+
  • For Angular in my case, the URL had two slashes //. In that case, shouldn't it be the 404?
  • Thanks, but i'm still having the same issue. An update though: I have two endpoints that I am trying to hit, and in my views.py, serializers.py, and urls.py they are created exactly the same, the only difference really is the models. The 2nd of my two endpoints is working properly in chrome, but the first is still throwing the cors headers error described above. Both work as intended in firefox.
  • This is kind of peculiar. Are we sure that all the packages have been installed properly or some dependency that has been missed. Ideally you adding 'corsheaders.middleware.CorsMiddleware' should have worked.
  • Since i see that you have Middleware settings.I assume you have already installed the corsheaders. Just make sure 'corsheaders.middleware.CorsMiddleware', 'django.middleware.common.CommonMiddleware', are in the top of the MiddleWare settings