JSON response returned as string instead of dict (Flask integration)

### JSON response returned as string instead of dict (Flask integration)

**Description**  
SDK returns raw string instead of parsed JSON, adding boilerplate in Flask apps.

**Code snippet**

    from flask import Flask
    import json

    app = Flask(__name__)

    resp = client.request("GET", base_url, "/advance")
    data = json.loads(resp)

**Issue**  
Expected automatic JSON decoding.