Error on gzipped content

twitch.py

from flask import Flask, redirect, url_for, session
from flask import request, jsonify
from flask_oauthlib.client import OAuth


APP = Flask(__name__)
APP.debug = True
APP.secret_key = 'development'


OAUTH = OAuth(APP)
TWITCH = OAUTH.remote_app(
    'twitch',
    app_key="TWITCH",
    base_url='https://api.twitch.tv/kraken/',
    request_token_url=None,
    access_token_method='POST',
    access_token_url='https://api.twitch.tv/kraken/oauth2/token',
    authorize_url='https://api.twitch.tv/kraken/oauth2/authorize',
    request_token_params={'scope': ["user_read", "user_subscriptions"]},
    consumer_key='REPLACE_ME',
    consumer_secret='REPLACE_ME'
)


def change_twitch_header(uri, headers, body):
    auth = headers.get('Authorization')
    if auth:
        auth = auth.replace('Bearer', 'OAuth')
        headers['Authorization'] = auth
    headers['Accept'] = "application/vnd.twitchtv.v5+json"
    return uri, headers, body


TWITCH.pre_request = change_twitch_header


@APP.route("/")
def index():
    if 'twitch_token' in session:
        is_sub = TWITCH.get('users/{:d}/subscriptions/{:d}'.format(
            29776980, 29776980
        ))
        print(is_sub._resp.headers)
        return jsonify(is_sub.data)
    return redirect(url_for('login'))


@APP.route("/login")
def login():
    return TWITCH.authorize(callback=url_for('authorized', _external=True))


@APP.route('/logout')
def logout():
    session.pop('twitch_token', None)
    return redirect(url_for('index'))


@APP.route('/login/authorized')
def authorized():
    resp = TWITCH.authorized_response()
    if resp is None:
        return 'Access denied: reason=%s error=%s' % (
            request.args['error_reason'],
            request.args['error_description']
        )
    session['twitch_token'] = (resp['access_token'], '')
    return redirect(url_for('index'))


@TWITCH.tokengetter
def get_twitch_oauth_token():
        return session.get('twitch_token')


if __name__ == '__main__':
    APP.run()