airframe-netty: Performance optimziation

[xerial]

No description provided.

[codecov]

Codecov Report

Merging #2462 (a0ac6fc) into master (41b2ca7) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2462      +/-   ##
==========================================
- Coverage   81.89%   81.88%   -0.02%     
==========================================
  Files         331      331              
  Lines       13546    13561      +15     
  Branches     2064     2099      +35     
==========================================
+ Hits        11094    11104      +10     
- Misses       2452     2457       +5     

Impacted Files	Coverage Δ
...scala/wvlet/airframe/http/client/HttpClients.scala	72.54% <ø> (ø)
...vlet/airframe/http/netty/NetthRequestHandler.scala	60.86% <58.33%> (-5.04%)	⬇️
...wvlet/airframe/http/client/JavaClientChannel.scala	95.00% <87.50%> (-1.97%)	⬇️
.../scala/wvlet/airframe/http/netty/NettyServer.scala	89.58% <100.00%> (+1.48%)	⬆️
...frame-rx/src/main/scala/wvlet/airframe/rx/Rx.scala	83.95% <0.00%> (-1.24%)	⬇️

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