Mercure-Hub: How Mercure-hub Works
This documentation is part of the Getting Started guide. You can view the complete guide here: How to Get Started with Mercure-hub.
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Consider a scenario where a customer is viewing a book with the ID 1.
On the front end, you subscribe to the topic /books/1 on Mercure-hub using the Server-Sent Events (SSE) API, a native HTML5 feature. With around 10 lines of JavaScript code and no need for external libraries, this approach remains both simple and efficient.
On the back end, when a book is purchased, you send an HTTP request to Mercure-hub to update the stock. For instance, if there are 7 books with the ID 1 and a user buys one, the updated stock becomes 6.
Your back end sends { stockCount: 6 } to the topic /books/1 on Mercure-hub so that every user viewing that book instantly receives the updated stock count. This process requires only an HTTP request from the back end and just a few lines of code on the front end.
This principle can be used to push data from the server to the client, between clients, or even between servers.