Add long-polling in HTTP handler

[markuswustenberg]

Fixes #17

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.69%. Comparing base (ad4b7e6) to head (16e1fa9).

❗ Current head 16e1fa9 differs from pull request most recent head 8e78d12. Consider uploading reports for the commit 8e78d12 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   87.93%   89.69%   +1.75%     
==========================================
  Files           2        2              
  Lines         199      233      +34     
==========================================
+ Hits          175      209      +34     
  Misses         17       17              
  Partials        7        7              

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