Azure Web App + Node.js + Azure AD = Error 431
问题 I created a Node.js based web application, running in an Azure Web App, that I wanted to put behind an Azure Active Directory authentication. After activating "App Service Authentication", the login process works normally, however upon returning to my app, it just returns a HTTP 431 "Request Header Fields Too Large". To validate it's not my app, I checked the Azure web app sample for Node.js and even this returns a 431 when activating AAD. Steps to reproduce: Create new Azure resource -> Web