Go automatically parses basic auth credentials from HTTP_PROXY and http.DefaultClient configures http.ProxyFromEnvironment by default. So we just need to ensure we're using Go HTTP clients wherever is appropriate and registering any/all custom CA certs with their HTTP transports.

Which rules require proxy support?

• TCPConn (drop netcat in favour of a Go HTTP client)
• HTTPFile (update the HTTP client)
• DNS (N/A, unless we want to validate DNS proxies, which we aren't doing. ref: https://stackoverflow.com/questions/17315385/dns-lookup-and-http-proxies)
• ICMP, IP Range, MTU (https://superuser.com/questions/175428/how-to-ping-when-behind-a-proxy)

Related:

• 🌱 Proxy with basic authentication validator#159
• 🌱 Proxy with basic authentication validator-plugin-oci#65