Environment variables in launch.json is not processing ${auto-detect-url}

From @corretge on November 29, 2017 8:49

When I try to put a launch variable in launch.json

            "env": {
                "ASPNETCORE_ENVIRONMENT": "Development",
                "ENV_GLOBAL_CURRENT_URL" : "${auto-detect-url}"
            }

I get this value:

"${auto-detect-url}"

instead

"http://localhost:5000"

• VSCode Version: 1.18.1
• OS Version: Windows 10

Steps to Reproduce:

1. Create a C# project
2. Set environment variables for a debug configuration as explained at begin
3. Add Environment.GetEnvironmentVariable(“ENV_GLOBAL_CURRENT_URL”)
4. Debug until this instruction

Copied from original issue: Microsoft/vscode#39294

[gregg-miskelly]

Thanks @corretge, this isn’t something that is possible. The debugger doesn’t know the value of ${auto-detect-url} – it watches your application run, and when it outputs the right message to stdout we grab it and start a browser. It is actually your application that does know this value. I am afraid I am not enough of an ASP.NET Core expert to tell you exactly where the framework is reading the URL from, but you could read the URL from whatever configuration file ASP.NET is getting it from.

[corretge]

I want to know this value in my application, and my first approach was to set as an environment variable.