Accessing request.data breaks JSON parsing

Question

I'm trying to lowercase a username in a login request before passing it to the login view provided by django-rest-framework-jwt. This code:

@api_view(['POST'])
def login(request):
    return obtain_jwt_token(request)

Works fine, though of course it effectively does nothing. Strangely, adding

print request.data

before the function returns causes a 400 error to be produced, with the message:

{"detail":"JSON parse error - No JSON object could be decoded"}

Why does simply reading the request object break the JSON parsing in this way?

Versions:

Django==1.9.1
djangorestframework==3.3.2
djangorestframework-jwt==1.7.2

As an added note: the print statement works fine, but breaks the JSON parsing. Printing request.POST has the same effect, however, printing request.body does not cause the error.

Answer 1

Because of reasons "Content-Type: application/json" header breaks DRF-JWT. Just remove it.

Seen here .