This document discusses securing APIs with Azure Active Directory (AD) authentication from SharePoint Framework (SPFx) solutions. It introduces the AadHttpClient SDK that can be used to call APIs secured with Azure AD without dealing with OAuth flows directly. The SDK handles retrieving access tokens automatically based on the permissions configured for the calling web part in the Azure AD tenant. The document provides an overview of how AadHttpClient works and links to additional resources on setting up API permissions and enabling cross-origin resource sharing (CORS) for APIs.
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