In this slide, i cover what Middleware is, how we used to handle middleware stuffs in WebApi etc

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4.  Handling request in WebApi
 Introducing lightweight ASP.NET Core

5. A new open-source and cross-platform framework for building modern
cloud-based Web applications using .NET

6. Choose your Editors
and Tools
Open Source
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Seamless transition
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Faster Development CycleTotally Modular
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8. How will you -
• Modify request headers ?
• Add a response header to responses ?
• Validate requests before they reach the controller ?
• Log the incoming requests and the outgoing responses ?

10. 1. HttpServer
2. HttpRoutingDispatcher
3. HttpControllerDispatcher

11. Three simple steps :
1. Inherit from DelegatingHandler
2. Override the send async method
3. Put it on the pipeline(Register your handler)

12. public class MessageHandler1 : DelegatingHandler
{
protected async override Task<HttpResponseMessage>
SendAsync(HttpRequestMessage request,
CancellationToken cancellationToken)
{
var response = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new StringContent(“Inside MessageHandler1")
};
var tsc = new TaskCompletionSource<HttpResponseMessage>();
tsc.SetResult(response);
return await tsc.Task;
}
}

13. public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.MessageHandlers.Add(new MessageHandler1());
// Code Excerpt
}
}

16. ResponseRequest Middleware

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22. Thank You