Fixed Issue #180 fixing expansion of header values in the environment variable

[baubakg]

Description

Fixing issue #180 where we did not expand environment variables with header values.

Related Issue

Fixes #180

Types of changes

• [x ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[sonarqubecloud]

Quality Gate passed

Issues
88 New issues
0 Accepted issues

Measures
0 Security Hotspots
99.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.61%. Comparing base (a7f7982) to head (0c1b33b).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #182      +/-   ##
============================================
+ Coverage     92.57%   92.61%   +0.03%     
- Complexity      291      292       +1     
============================================
  Files            26       26              
  Lines           795      799       +4     
  Branches         69       69              
============================================
+ Hits            736      740       +4     
  Misses           46       46              
  Partials         13       13              

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