Getting socket hang up issue

When I try with multiple phases, I am getting socket hang up error on Postman. Actually I have created app,py file on top of run.py and using Flask like

On each phase I am giving responsibility to create multiple files based on my requirement.

app = Flask(__name__)

@app.route('/generate_project', methods=['POST'])
def run_endpoint():

    try:
        # Only pass the required parameters and use defaults for the rest
        result = run_chat_chain(app_name=app_name, other_detail: details
        )
        return jsonify(result), 200
        # return result, 200
    except Exception as e:
        return jsonify({"status": "error", "message": str(e)}), 500

Start with app.py and run.py, then reproduce the multiple-phase POST request to /generate_project from Postman. Trace the run_chat_chain call and capture where the socket hang up occurs; done means the failure is reproducible with a clear cause and the endpoint behavior is verified.