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API Key Authentication is commonly used in S2S scenarios. You provide the API caller a unique key that they use to authenticate with your API. The API Key can be sent in a few ways. For example, it can be sent in a request header, the query string, or in a cookie. I'll show you how to implement API Key authentication in Minimal APIs and how to do it with controllers.

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How To Implement API Key Authentication In ASP.NET Core
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Chapters
0:00 Defining an endpoint filter
1:50 Implementing ApiKeyAuthenticationEndpointFilter
6:45 How an endpoint filter works
8:37 Validating the API key
12:32 Alternatives to sending the API key in the header
13:22 Alternatives to storing API keys in the application configuration
14:12 API key authentication with controllers

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