fix #713: CORS headers are lost

[localvar]

No description provided.

[codecov-commenter]

Codecov Report

Merging #723 (9c44203) into main (c992926) will decrease coverage by 0.26%.
The diff coverage is 31.34%.

@@            Coverage Diff             @@
##             main     #723      +/-   ##
==========================================
- Coverage   80.20%   79.93%   -0.27%     
==========================================
  Files          95       95              
  Lines       10647    10705      +58     
==========================================
+ Hits         8539     8557      +18     
- Misses       1617     1654      +37     
- Partials      491      494       +3     

Impacted Files	Coverage Δ
pkg/filters/proxy/pool.go	57.04% <26.98%> (-4.95%)	⬇️
pkg/filters/validator/validator.go	85.18% <100.00%> (+0.37%)	⬆️
pkg/object/mqttproxy/client.go	80.63% <0.00%> (+0.90%)	⬆️

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