optimize: filter invalid char in header

[welkeyever]

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[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (1f93aaa) 82.47% compared to head (22226d3) 82.51%.

Files	Patch %	Lines
pkg/protocol/header.go	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1039      +/-   ##
===========================================
+ Coverage    82.47%   82.51%   +0.04%     
===========================================
  Files           98       98              
  Lines        10002    10011       +9     
===========================================
+ Hits          8249     8261      +12     
- Misses        1253     1254       +1     
+ Partials       500      496       -4     

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