client/http: pass res interface into respHandler

[JmPotato]

What problem does this PR solve?

Issue Number: ref #7300.

What is changed and how does it work?

Pass `res` interface into `respHandler`.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• rleungx

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[JmPotato]

/merge

[ti-chi-bot]

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 8d10a15

[codecov]

Codecov Report

Merging #7404 (8d10a15) into master (2349f01) will increase coverage by 0.05%.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7404      +/-   ##
==========================================
+ Coverage   74.23%   74.28%   +0.05%     
==========================================
  Files         451      451              
  Lines       49169    49170       +1     
==========================================
+ Hits        36499    36525      +26     
+ Misses       9433     9416      -17     
+ Partials     3237     3229       -8     

Flag	Coverage Δ
unittests	74.28% <0.00%> (+0.05%)	⬆️

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