Fix contentType conversion in TransportFactories classes

[Kaspiman]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.07%. Comparing base (46ba8fb) to head (831502a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #92   +/-   ##
=========================================
  Coverage     88.07%   88.07%           
  Complexity      633      633           
=========================================
  Files           114      114           
  Lines          2599     2599           
=========================================
  Hits           2289     2289           
  Misses          310      310           

Flag	Coverage Δ
phpunit	88.07% <100.00%> (ø)

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[gaelreyrol]

Hi @Kaspiman, thanks for your PR, I've permitted myself to edit your changes to add some tests to cover your fixes.
I also removed your TODO, instead I've created an issue to track it.