Vert.x EventBus

Vert.x: how to handle retry with the EventBus?

Vert.x is a polyglot library that helps to develop reactive applications. Among all its features, Vert.x comes with a built-in EventBus, which is a masterpiece in a event-driven (micro-services) architecture. What you will read about in this post: how to handle a retry on a request-response of the Vert.x EventBus with a classical Handler … with a[…]

Vert.x Service Discovery

Vert.x: implementing a custom Service Type for the Service Discovery

Vert.x is a polyglot library that helps to develop reactive applications. A good starting point on how Vert.x can help you to write such applications is the free-ebook Building Reactive Microservices in Java from Clément Escoffier or these talks: here and here. Besides Vert.x itself, Vert.x comes with lots of components that eases the development of reactive[…]

Spring Web Flux +

Using Spring Web Flux as a Java Client of

Despite the fact Server-Sent Events (aka SSE) is a bit older than WebSocket, SSE is less known than WebSockets as a push technology. If you wish to get the difference between Server-Sent Events and WebSockets, you can read this article or watch one videos of our great drones enchantress Audrey (here). But it seems there is[…]

Vert.x logo

Vert.x and the async calls chain

Vert.x is a nice polyglot library to write reactive applications. Based on the multi-reactor pattern, the core concept of Vert.x is the event loop that dispatches work/events to handlers. The event loop is single threaded. But you can have multiple event loops (hence, the multi-reactor pattern). What you will read about in this post: A Classic “Hello[…]


Integrate Server-Sent Events in your Apple Watch for WatchOS 2

Real-time data animation in your Apple Watch with A few months back, I demonstrated how to animate data in Real-Time in your iOS applications using with a New York Times API (see my blogpost here). With the growing success of smartwatches and the launch of the Apple Watch a couple years ago, a lot of companies[…]


How to inject Query Params and HTTP headers

This is the second post of a “How to” series which aims to highlight simple but yet powerful features of In my previous post I explained the different options to configure the polling frequency. Today will focus on the ability of proxy to inject custom query parameters or HTTP Headers while performing the request against a target[…]


Add compression to Server-Sent events with Undertow

Introduction With this post, we’ll tell you how we added compression support to a Server-Sent Events server built with Undertow. Our goal was to validate that this compressed flow would directly be understood by our favorite browsers: Chrome, Firefox, Safari, even IE, and possibly more… The context At, we build up an incremental API cache[…]