Delegating handlers are like ASP.NET Core middleware. Except they work with the HttpClient. The ASP.NET Core request pipeline allows you to introduce custom behavior with middleware. You can solve many cross-cutting concerns using middleware — logging, tracing, validation, authentication, authorization, etc.
But, an important aspect here is that middleware works with incoming HTTP requests to your API. Delegating handlers work with outgoing requests.
Read more here
https://www.milanjovanovic.tech/blog/extending-httpclient-with-delegating-handlers-in-aspnetcore
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