request.read() is empty in POST

Hello! I'm getting crazy, PLEASE someone, give me some light!!!

I'm using Django 1.10.4, Python 3.5 on Windows using Visual Studio Community 2015.

I have some class-based views to response some json.

from django.views.generic import View
from json import loads
from bson.json_util import dumps
from django.http import HttpResponse, HttpRequest

class Topicos(View):
   def post(self, request):
       req = request.read().decode(self.request.encoding)

Have the following setting on urls.py:

url(r'^api/Topicos', Topicos.Topicos.as_view(), name='Topicos'),

The request.read() is empty, the request is: 

POST /api/Topicos HTTP/1.1
Host: localhost:55020
Connection: keep-alive
Content-Length: 93
Accept: application/json, text/plain, */*
Origin: http://localhost:55020
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36
X-CSRFToken: VRiCt3Lz1EIdKGWt3lknpcgdFpD8XbrwSxdPT4P9dd1tbrGYmgE8uHdEIH2dzP5h
Content-Type: application/json;charset=UTF-8
Referer: http://localhost:55020/
Accept-Encoding: gzip, deflate, br
Accept-Language: pt-BR,pt;q=0.8,en-US;q=0.6,en;q=0.4
Cookie: csrftoken=VRiCt3Lz1EIdKGWt3lknpcgdFpD8XbrwSxdPT4P9dd1tbrGYmgE8uHdEIH2dzP5h

{"titulo":"Título 1","mensagem":"mensagem","email":"flavio@email.test.br","usuario":"Flávio"}

I really don't know what else I can do. I have the same code (except na class name) running correctly to another posts.

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