Single quote in json bytes from RequestFactory

[Dunatotatos]

Hi all,

If we use RequestFactory to build a JSON request, the body of the request is built with single quotes instead of double-quotes. However, According to ​ECMA-404, chapter 9-String:

A string is a sequence of Unicode code points wrapped with quotation marks (U+0022).

Using the standard json library to load this payload raises an Exception.

Here is a MVP to run in a Django console:

>>> import json
>>> from django.test import RequestFactory
>>> 
>>> data = {'key': 'value'}
>>> request = RequestFactory().post('/', data, content_type='application/json')
>>> request.body # Here, we see the JSON has been encoded with single quotes.
b"{'key': 'value'}"
>>> json.loads(request.body) # And json.loads refuses the single quote
Traceback (most recent call last):
[...]
json.decoder.JSONDecoder: Expecting property name enclosed in double quotes: line 1 column 2 (char 1)

If this is an expected behavior, it should probably be documented somewhere in ​this page, as well as how to POST a JSON request. Except if I miss something, of course.

[Claude Paroz]

Should be fixed in Django 2.1 (see #29082).