[Answer]-Django nested body request not being set

Explicitly encode the dictionary to prevent form-encoding. Otherwise, it will be form-encoded as the way similar to urllib.urlencode (or urllib.parse.urlencode in Python 3.x).

import json

...

requests.options(
    headers.kwargs['url'], headers=headers.headers, 
    data=json.dumps({'parent': {'id': 'xxxx'}, 'name': 'name.pdf'}))

In other word, instead of passing a dictionary, pass a string.

According to More complicated POST requests – Request documentation:

…
There are many times that you want to send data that is not
form-encoded. If you pass in a string instead of a dict, that data
will be posted directly.