View function did not return a response in flask

Question

I have a code below which setups cookie and then adds this cookie to the response with set_cookies function. However, even though I return a response I received the following error:

ValueError: View function did not return a response

My code is simply this:

def login():

 if request.method == "POST":
    timestamp = str(int(time.time()))
    cookie = timestamp+'user'
    cookie = base64.b64encode(cookie.encode('utf-8')).decode('utf-8')
    resp = make_response()
    resp = resp.set_cookie("LoginCookie",cookie)
    return resp

Answer 1

response.set_cookie is an in-place operation. This means that if you set something to it's return value, it will be None, which is the default return value (functions with no return return None). What should be used instead is:

resp.set_cookie("LoginCookie",cookie)