Introduction
Single Page Applications (SPA) have definitely become very popular and fashionable lately in the world of web development. An SPA has a single HTML page, as its name implies, and uses a large amount of JavaScript files to modify that single page with new content as the user clicks around in the interface. In contrast, traditional web applications serve up a complete HTML page upon every new request and rely on a relatively small amount of JavaScript to work. We can call these traditional web apps as multi-page applications or MPAs.
In an MPA there’s a lot of traffic between the browser and the server as the browser requests new HTML content to be rendered for the website user. The amount of HTTP traffic in an SPA is a lot smaller as much of the rendering and website interaction is delegated to the client via JavaScript files. An SPA front-end typically consults the web server for some set of information, such as a filtered list of products, and the web server responds with a document in some format, most often JSON. The client then takes this JSON document and renders it in a way that’s understandable for the client, like a fancy table. The web server hosts an API which any client can contact via HTTP calls and an SPA front-end is no exception.
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