I am trying to access a Basic-Auth secured WMS Service. Unfortunately it won't work, no header is sent.

What kind of authentication is used in ArcGIS Pro (or ESRI products in general) when adding username/password in the "Add WMS Connection" Dialog?

I am trying to access a Basic-Auth secured WMS Service. When requesting the Capabilities document, the service will always list some layers, even without authentication. But with authentications, more layers should be listed.

Unfortunately it won't work, only publicly available layers are listed in ArcGIS Pro. When I look at the HTTP request I can not see an Authorization header.

What kind of authentication is used in ArcGIS Pro (or ESRI products in general) when adding username/password in the "Add WMS Server Connection" Dialog? How is this intended to work?

I am completely in control of said service, it is possible to debug and configure any way we like. At the moment it supports HTTP Basic only but other methods could be implemented. I tested this service with a Browser and QGIS, where everything works as expected.

I am trying to access a Basic-Auth secured WMS Service. Unfortunately it won't work, no header is sent. What kind of authentication is used in ArcGIS Pro (or ESRI products in general) when adding username/password in the "Add WMS Connection" Dialog?

I am trying to access a Basic-Auth secured WMS Service. Unfortunately it won't work, no header is sent. 

What kind of authentication is used in ArcGIS Pro (or ESRI products in general) when adding username/password in the "Add WMS Connection" Dialog?