Recap of real-time web APIs

We introduced a few technologies that can be used to implement real-time web APIs in Chapter 1. Each technology has its pros and cons. To simplify the implementation of real-time web APIs, Microsoft provides SignalR, which supports multiple transports, such as WebSockets, SSE, and long polling. SignalR will automatically choose the best transport based on the client’s capabilities. On top of that, SignalR provides a simple programming model to implement real-time web APIs. Developers do not need to worry about the underlying transport details; instead, they can focus on the business logic.

SignalR was first introduced for ASP.NET in 2013. As of now, SignalR has been rewritten for ASP.NET Core and is included in the ASP.NET Core framework. So, there are two different versions of SignalR: one for ASP.NET and one for ASP.NET Core. If you are using ASP.NET Core, you do not need to install any additional packages to use SignalR. There are also some...