SP 2013/2016 on-premise - Pass authentication (token?) to external REST API

Copper Contributor

This concerns SharePoint 2013/2016 on premises - NOT online, Azure is not in the picture - no SPFx 


Can I from a web part call an external REST API and pass the user's identity in the request ?

How can the external REST API verify the user's identity is genuine ?


Both web part and external REST API are under my control. I can contact SharePoint from the REST API for example.



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