Pkg: Proxy Authentication Required (Received HTTP code 407 from proxy after CONNECT)

General Usage
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Hello,

I am currently working with Julia 1.7.2 on a linux machine through ssh which requires a proxy to access the internet.

By configuring the environment variables “http_proxy” and “https_proxy” to http://usr:@some_address:port/ (there is no password), I was able to clone repositories with git in the command line and make requests using wget or curl.

However I was not able to install any Julia packages because of this error:

(v1.7) pkg> add JSON
    Updating registry at `~/.julia/registries/General.toml`
┌ Warning: could not download https://pkg.julialang.org/registries
│   exception = HTTP/1.1 407 Proxy Authentication Required (Received HTTP code 407 from proxy after CONNECT) while requesting https://pkg.julialang.org/registries
└ @ Pkg.Registry /buildworker/worker/package_linux64/build/usr/share/julia/stdlib/v1.7/Pkg/src/Registry/Registry.jl:82
   Resolving package versions...
     Cloning [682c06a0-de6a-54ab-a142-c8b1cf79cde6] JSON from https://github.com/JuliaIO/JSON.jl.git
ERROR: failed to clone from https://github.com/JuliaIO/JSON.jl.git, error: GitError(Code:ERROR, Class:HTTP, proxy authentication required but no callback set)

After some research I found this topic: Can't install packages on corporate pc · Issue #2516 · JuliaLang/Pkg.jl · GitHub
Setting JULIA_PKG_USE_CLI_GIT to true circumvents the issue, but I am still stuck with this problem: “Proxy Authentication Required (Received HTTP code 407 from proxy after CONNECT)” which occurs when trying to update the package registry.

On top of that I am quite sure that this issue is also responsible for this error :

(v1.7) pkg> add CUDA
...
  Downloaded artifact: LLVMExtra
ERROR: Unable to automatically install 'LLVMExtra' from '/home/.julia/packages/LLVMExtra_jll/y3M2E/Artifacts.toml'
Stacktrace:
  [1] error(s::String)
    @ Base ./error.jl:33
  [2] ensure_artifact_installed(name::String, meta::Dict{String, Any}, artifacts_toml::String; platform::Base.BinaryPlatforms.Platform, verbose::Bool, quiet_download::Bool, io::Base.TTY)
    @ Pkg.Artifacts /home/julia-1.7.2/share/julia/stdlib/v1.7/Pkg/src/Artifacts.jl:441
  [3] download_artifacts(env::Pkg.Types.EnvCache; platform::Base.BinaryPlatforms.Platform, julia_version::VersionNumber, verbose::Bool, io::Base.TTY)
    @ Pkg.Operations /home/julia-1.7.2/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:617
  [4] add(ctx::Pkg.Types.Context, pkgs::Vector{Pkg.Types.PackageSpec}, new_git::Set{Base.UUID}; preserve::Pkg.Types.PreserveLevel, platform::Base.BinaryPlatforms.Platform)
    @ Pkg.Operations /home/julia-1.7.2/share/julia/stdlib/v1.7/Pkg/src/Operations.jl:1182
...

I cannot debug the installation of the artifact with “DebugArtifacts” since it is not in the registry currently on the machine (which I copied from another machine with proper internet access):

julia> Pkg.add("DebugArtifacts")
ERROR: The following package names could not be resolved:
 * DebugArtifacts (not found in project, manifest or registry)

I am aware that this is most likely a proxy configuration issue, but I do not know which things to configure in order for Julia to work properly.