Revoke endpoint content type is causing failure even though the status code is 200

[pratik1701]

Here is the current Implementation of the userManager and signoutCallback

During the Signout Operation we are seeing the revoke call being made with a status code of 200

But the response looks like this

Due to the response not being in a JSON format the call is failing internally in the node package and is hitting the catch block of the sigoutCallback implementation. I have followed a similar issue fix for this here #1650, but I that doesn't seem to fix the issue. Is there a workaround for this issue.