SharePoint 2016 | CORS | JavaScript/CSOM calls not working/loading in Edge or Chrome when accessing site through Reverse Proxy URL or Network Load Balancer. SharePoint throwing 403 forbidden error.

SYMPTOM Symptom 1: SharePoint is showing unexpected response (403 error) in Edge or Chrome Browsers but not in Internet Explorer whenever a call to client.svc/ProcessQuery is sent to the server as an incoming request. For example, after adding a people column to a document library and typing in a username, test Symptom 2: SharePoint is…

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