How to return HTTP 400 response in Django?

You can do the following:

from django.core.exceptions import SuspiciousOperation
raise SuspiciousOperation("Invalid request; see documentation for correct paramaters")

SuspiciousOperation is mapped to a 400 response around line 207 of https://github.com/django/django/blob/master/django/core/handlers/base.py

From my previous comment :

You can return a HttpResponseBadRequest

Also, you can create an Exception subclass like Http404 to have your own Http400 exception.

If you're using the Django Rest Framework, you have two ways of raising a 400 response in a view:

from rest_framework.exceptions import ValidationError, ParseError

raise ValidationError

# or 
raise ParseError

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