We've already shown you in a previous tutorial how to upload files and how to upload multiple files to a server. In this tutorial, we'll show you a way of uploading multiple files with one request without knowing how many files it'll be. This is useful when the user can …

HTTP as a stateless protocol won’t keep the client’s state across different requests in your application. A common example for this scenario is the log-in and afterwards remember the user credentials for a defined time interval, like until the browser window gets closed. In case you don’t …

Retrofit offers a wide range of functionalities and there are a lot of possible configurations. A lot of larger applications will require some specific setup, for example for OAuth authentication. In order to achieve a clean and stable project, we'll introduce you our idea of a sustainable Android client: the …

Google highly recommends to use ProGuard for release builds which get distributed via Google Play. We’ll guide you through the basic setup of ProGuard and show you how to configure Picasso in the phase of release preparation. First, let’s get a wrap up about ProGuard and afterwards we …

In the getting started with Retrofit tutorial you've implemented your first request against one GitHub endpoint. Hopefully, you're excited to try out more of Retrofit's functionality. In this tutorial, you'll learn in more detail how to describe API endpoints in Retrofit. {{outline}} {{video}} How to Describe API Endpoints As you've …

The system process of Node.js starts your applications with a default memory limit. If you’re going to run an application that saves a lot of data into variables and therefore memory, you may run into a Node.js process exit due to allocation issues. Increasing Node’s memory …

Handling request headers isn’t a use case that comes to mind immediately when thinking through the development process of your app. You might think of routes, requests, appropriate responses and the design of your views. And at some point, you’re in a more advanced development stage and see …

Node.js developers are very familiar with the callback pattern. During the last years, a common practice has taken place within the community: error-first callbacks. That was quite sufficient for the last years. Now that promises and generator functions are around the corner, it’s time to start thinking outside …