Support for proxies via requests

This may already be possible, but I finding it in the docs - is there support to pass the "proxies" keyword through pyvo to requests, in order to use e.g. SOCKS proxies to access servers behind firewalls etc.?

(use case - I want to test services running on development TAP servers, which can most easily be access through an SSH tunnel/SOCKS5 proxy - this functionality is built into requests, so I think it's just passing the relevant parameter through pyvo)

No file or test is named. Start by locating pyvo's request or session entry points and how they call requests; verify the expected behavior against a SOCKS5 proxy and a TAP server, with completion meaning proxy settings can be passed through to requests.

Written by the indexing model from the issue text.