feat(proxy): add arguments to proxyconfig

[hiroppy]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

yep

Motivation / Use-Case

closes: #2369

Breaking Changes

no

Additional Info

[codecov]

Codecov Report

Merging #2714 into v4 will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##               v4    #2714   +/-   ##
=======================================
  Coverage   92.88%   92.88%           
=======================================
  Files          37       37           
  Lines        1293     1293           
  Branches      344      344           
=======================================
  Hits         1201     1201           
  Misses         88       88           
  Partials        4        4           

Impacted Files	Coverage Δ
lib/Server.js	96.33% <100.00%> (ø)

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