This week's book giveaways are in the Jython/Python and Object-Oriented programming forums. We're giving away four copies each of Machine Learning for Business: Using Amazon SageMaker and Jupyter and Object Design Style Guide and have the authors on-line! See this thread and this one for details.
the HTTP protocol dictates that there will a response, but it may not be the response that you want eg the response is sent immediately but the server has not finished processing yet.
HTTP requires the client to pull information, therefore (typically) the client would then need to poll the server waiting for the real response to be sent from the server