test: add new test cases for pkg/protocol/response.go

[gityh2021]

What type of PR is this?

test

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测试：为pkg/protocol/response.go文件新增测试用例。

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

en: add test cases for the following features for pkg/protocol/response.go and the test coverage rate of pkg/protocol/response.go is improved to 81.08%.
1.TestResponseMustSkipBody：test when to skip body read and copy.
2.TestResponseBodyGunzip: test compress and decompress body with gzip.
3.TestResponseSwapResponseBody.
4.TestResponseAcquireResponse: test acquire and release response.
zh(optional):

Which issue(s) this PR fixes:

#257

[CLAassistant]

All committers have signed the CLA.

[L2ncE]

You can improve your description according to the PR template and can describe the situation of unit test coverage.

[codecov]

Codecov Report

Base: 67.53% // Head: 67.87% // Increases project coverage by +0.34% 🎉

Coverage data is based on head (37734f1) compared to base (d601515).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #374      +/-   ##
===========================================
+ Coverage    67.53%   67.87%   +0.34%     
===========================================
  Files           89       89              
  Lines         8608     8608              
===========================================
+ Hits          5813     5843      +30     
+ Misses        2435     2404      -31     
- Partials       360      361       +1     

Impacted Files	Coverage Δ
pkg/common/compress/compress.go	80.95% <0.00%> (-2.86%)	⬇️
pkg/protocol/header.go	74.25% <0.00%> (+0.26%)	⬆️
pkg/protocol/response.go	81.08% <0.00%> (+20.94%)	⬆️

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[welkeyever]

Please resign the CLA🙏

[gityh2021]

done

Please resign the CLA🙏

[welkeyever]

It is best to note the change in overall coverage in the description.

[gityh2021]

It is best to note the change in overall coverage in the description.

done, sorry to close this pr...