Update http example with json protocol

[ramgdev]

Fixes #
Design discussion issue (if applicable) #

Changes

• Update http example to enable http-json feature
• Update code to specify protocol when building http exporter

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.0%. Comparing base (224289e) to head (0e3495f).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1912   +/-   ##
=====================================
  Coverage   75.0%   75.0%           
=====================================
  Files        122     122           
  Lines      20276   20276           
=====================================
  Hits       15221   15221           
  Misses      5055    5055           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[lalitb]

Thanks, LGTM.