Test start_tls for server side as well

[tarasko]

No description provided.

[codspeed-hq]

Merging this PR will not alter performance

✅ 46 untouched benchmarks

---

_{Comparing improve_stls_test (5fce911) with master (93ea9bb)}

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.11%. Comparing base (93ea9bb) to head (c3583e9).
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
- Coverage   91.85%   90.11%   -1.75%     
==========================================
  Files          14       13       -1     
  Lines        2639     2589      -50     
  Branches       15       15              
==========================================
- Hits         2424     2333      -91     
- Misses        211      250      +39     
- Partials        4        6       +2     

Flag	Coverage Δ
Linux	89.91% <ø> (+0.50%)	⬆️
Windows	?
macOS	87.09% <ø> (+0.50%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

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

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.