fix(http-handler): base64 response instead of json

[rustatian]

Reason for This PR

• bugfix release

Description of Changes

• fix bug with the base64 responses in some edge cases.

License Acceptance

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

PR Checklist

[Author TODO: Meet these criteria.] [Reviewer TODO: Verify that these criteria are met. Request changes if not]

• [x] All commits in this PR are signed (git commit -s).
• [x] The reason for this PR is clearly provided (issue no. or explanation).
• [x] The description of changes is clear and encompassing.
• [x] Any required documentation changes (code and docs) are included in this PR.
• [x] Any user-facing changes are mentioned in CHANGELOG.md.
• [x] All added/changed functionality is tested.

[codecov[bot]]

Codecov Report

Merging #119 (9d98d78) into master (571ec88) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #119   +/-   ##
=======================================
  Coverage   43.49%   43.49%           
=======================================
  Files          12       12           
  Lines         561      561           
=======================================
  Hits          244      244           
  Misses        306      306           
  Partials       11       11           

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