Is your feature request related to a problem? Please describe.
When debugging API endpoints or the client itself, it is useful to allow use of a proxy to inspect requests, responses, and simulate failures. Current client does not configure use of a proxy.

Describe the solution you'd like
Read http.proxyHost et al, or a custom vmarg to allow inspection of client traffic.

Describe alternatives you've considered
Burp Suite or another dedicated MITM tool can be used, but is less "normal" than a proxy server.