Increased unit test coverage for pkg/protocol/header_test

[XiaoYi-byte]

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提高pkg/protocol/header_test的测试覆盖率从77.2%到80.9%

(Optional) More detailed description for this PR(en: English/zh: Chinese).

en: Increased unit test coverage for pkg/protocol/header_test from 77.2% to 80.9%
zh(optional): 提高pkg/protocol/header_test的测试覆盖率从77.2%到80.9%

(Optional) Which issue(s) this PR fixes:

Fixes #257

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.84%. Comparing base (f91ce33) to head (df48c98).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1074      +/-   ##
===========================================
+ Coverage    82.52%   82.84%   +0.31%     
===========================================
  Files           98       98              
  Lines        10030    10030              
===========================================
+ Hits          8277     8309      +32     
+ Misses        1257     1232      -25     
+ Partials       496      489       -7     

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