Cannot download OmniSharp behind proxy/firewall

From @TheBlueSky on July 18, 2016 4:37

Hello everyone,

I’m not sure if this is a VS Code or OmniSharp issue, so feel free to move it to the right repository if necessary.

When I open a .Net project, I get the following in Output window:

[INFO] Starting OmniSharp at 'c:\Users\xyz\Documents\My Web Sites\SomeProject'...
[INFO] Installing to C:\Users\xyz\.vscode\extensions\ms-vscode.csharp-1.2.2\.omnisharp
[INFO] Attempting to download omnisharp-1.9-beta11-win-x64-net451.zip...

And it gets stuck there. Nothing is downloaded and my project doesn’t have any kind of Intellisense (obviously).

Maybe this is relevant, and maybe not, but at work, we are behind a firewall and a proxy server (from Fortinet) that does strange stuff. One of which is using its own certificate for all HTTPS requests, which I faced an issue with when using an application that require a valid certificate signed by trusted CA, or an application that uses certificate pinning technique.

• VSCode Version: Code 1.3.1 (e6b4afa53e9c0f54edef1673de9001e9f0f547ae, 2016-07-12T13:35:06.227Z)
• OS Version: Windows_NT ia32 6.3.9600

Steps to Reproduce:

1. Go behind our proxy.
2. Open a .Net project 😃

Copied from original issue: Microsoft/vscode#9427

[fizxmike]

This worked for me (in VS Code settings file):

{
    "http.proxyStrictSSL": false,
    "http.proxy": "http://username:password@x.x.x.x:8080/"
}

[UrmaGurd]

This worked for me (in VS Code settings file):

{
    "http.proxyStrictSSL": false,
    "http.proxy": "http://username:password@x.x.x.x:8080/"
}

Unfortunately this doesn’t work for me. Our proxy doesn’t need username password so it’s just:

    "http.proxyStrictSSL": false,
    "http.proxy": "https://proxy._companydomain_.com:9090",

And as said above, this is the ONLY thing I can’t access or download from within Visual Studio behind our corporate firewall.