fix: Get port from Scheme

[mstruebing]

closes #54

What I did:

Why I did it:

[codecov-commenter]

Codecov Report

Merging #55 into master will decrease coverage by 1.65%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   62.70%   61.05%   -1.66%     
==========================================
  Files           3        3              
  Lines         185      190       +5     
==========================================
  Hits          116      116              
- Misses         44       49       +5     
  Partials       25       25              

Impacted Files	Coverage Δ
cache/cache.go	51.42% <0.00%> (-1.91%)	⬇️

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