protobuf-ts/protoc does not respect proxy environment variables

[mikonse]

When using the helper package @protobuf-ts/protoc to install the protoc compiler in an environment where no direct internet access is available but a proxy is configured through the environment variables HTTP_PROXY and or HTTPS_PROXY the http request to download the latest release from github will hang until it fails with a timeout (which makes sense as it cannot connect to github without a proxy).

It would be quite useful if the automatic downloading of the protobuf compiler would work behind a proxy as well.

Unfortunately it seems that the node https and http core modules do not respect the proxy environment variables so to implement this feature there are two options:

• use a different request library
• use a library which creates a http.Agent which respects the proxy env and pass that to https.get

A nice summary can also be found in this stackoverflow thread

[timostamm]

Supporting the HTTP_PROXY variables is a good call. Happy to accept a contribution, but an implementation that does not add dependencies would be preferred.