fix(api): Use provided Content-Type to create RequestBody

[tylerjroach]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:
#2647

Description of changes:

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1bebd89) 41.80% compared to head (ea45171) 41.84%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2666      +/-   ##
==========================================
+ Coverage   41.80%   41.84%   +0.03%     
==========================================
  Files         902      902              
  Lines       28998    29005       +7     
  Branches     4108     4110       +2     
==========================================
+ Hits        12124    12137      +13     
+ Misses      15546    15541       -5     
+ Partials     1328     1327       -1