Websphere Application Server - Web services - POST / DELETE issue problem

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Recently I was asked to create interfaces between a WebSphere Application Server (WAS) application and an other application.

There where already several GET / POST / PUT / DELETE api's created in the (WAS) application but, when I started with testing, the GET function was working but the rest I got an error.

After some investigation there was a setting missing (not set) in the WebSphere Application Server Console.

WAS setting for REST server

after checking "Use available authentication data when an unprotected URI is accessed" 
and appy, save and restart of WAS the PUT and other REST Webserver services where working!