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Published 20 hours ago • verified publisher icon EEParker

Error when behind corporate proxy on Windows: Self-referential requests to proxy are forbidden

Open dirvo opened this issue 5 years ago • 0 comments
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Problem description:

After upgrading a project from version 3.0.0 to version 3.1.2 of vueclimiddleware, I get the following response when accessing the app via its reverse proxy URL at https://localhost:/ with an HTTP 200 status:

<HTML><TITLE>Forbidden</TITLE><H1>Self-referential requests to proxy are forbidden</H1>Self-referential requests to this proxy server are forbidden</HTML>

Steps to reproduce

I reproduced this problem on Windows 10 2004, .NET Core 3.1

  • Being behind a corporate proxy, I have set the environment variables HTTP_PROXY=http://<proxy>:<port> and NO_PROXY=localhost .
  • Start the sample app in /samples/VueCliSample in this repo.

The browser opens at https://localhost:44323/ and displays the error message from above.

Workaround

The problem is caused by .NET Core 3.1 apparently ignoring the NO_PROXY variable and probably needs to be fixed by the .NET team where a similar issue is tracked for the Angular middleware (https://github.com/dotnet/aspnetcore/issues/14392).

As a workaround, the HTTP_PROXY can be unset in the launchSettings.json file:

"profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development",
        "NO_PROXY": "localhost",
        "HTTP_PROXY": ""
      }
    },
    "webapp": {
      "commandName": "Project",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "http://localhost:8080"
    }
  }

I'd suggest adding this to the documentation / wiki as a know issue

dirvo avatar Nov 09 '20 12:11 dirvo