Feat: support proxy-url

[Somefive]

Solves #140

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@8ab4e3b). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #141   +/-   ##
=========================================
  Coverage          ?   38.43%           
=========================================
  Files             ?       15           
  Lines             ?     1522           
  Branches          ?        0           
=========================================
  Hits              ?      585           
  Misses            ?      887           
  Partials          ?       50           

Flag	Coverage Δ
unit-test	38.43% <0.00%> (?)

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