feat: add way to set empty header on request #496

[jeevatkm]

closes #496

The solution is not to use the method Get on the Header, which returns an empty string for a non-existing header key. Instead, check directly in the header map

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.42%. Comparing base (c6cf259) to head (634b218).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #876      +/-   ##
==========================================
+ Coverage   98.15%   98.42%   +0.27%     
==========================================
  Files          14       14              
  Lines        2329     2414      +85     
==========================================
+ Hits         2286     2376      +90     
+ Misses         23       20       -3     
+ Partials       20       18       -2     

Flag	Coverage Δ
unittests	98.42% <100.00%> (+0.27%)	⬆️

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