PlantUML include from URL through a proxy

Question

I´m having a diagram in PlantUML (edited in VSCode@Windows 10) and there is a

!include https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Deployment.puml

in it. Im´m having the Plugin

PlantUML
v2.16.0

installed and now try to preview it with it. What I´m getting is an error

Cannot open URL https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/master/C4_Deployment.puml

When i curl that address over VSCode Terminal I´m getting results. The VSCode setting

Use the proxy support for extensions.

is on

"override"

As I´m working in company environment I specified

"plantuml.commandArgs": [
        "-Dhttp_proxy='http://localhost:3128/'",
        "-Dhttps_proxy='http://localhost:3128/'"
        ]

in plugin settings (this is correct in my environment)

Any idea what else I could try ?

Thanks guys!