Message handlers in Web API provide you the opportunity to process, edit, or decline an incoming request before it reaches the HttpControllerDispatcher.

When a request comes in to your ASP.NET site, it's routed through a series of message handlers (in ASP.NET Web API) or modules (in ASP.NET MVC), each of which performs some operation on the request.

Learn how to read request headers and work with optional data that is passed between the server and client in ASP.NET Core 5 applications. Topics Spotlight: AI-ready data centers ...