feat: add reverse-proxy awareness

[maltejk]

Add reverse-proxy awareness, including secure scheme detection.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.28%. Comparing base (3d94a70) to head (70e0280).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master      #14   +/-   ##
=======================================
  Coverage   84.28%   84.28%           
=======================================
  Files          60       60           
  Lines        1222     1222           
  Branches       77       77           
=======================================
  Hits         1030     1030           
  Misses        165      165           
  Partials       27       27           

Flag	Coverage Δ
unittests	84.28% <ø> (ø)

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