utils: let http client can reuse connections (#6914)

[ti-chi-bot]

This is an automated cherry-pick of #6914

What problem does this PR solve?

Issue Number: Close #6913

What is changed and how does it work?

utils: let HTTP client can reuse connections

Check List

Tests

• Manual test

Before:

pd-0(follower):

pd-1(leader):

After:

pd-1(follower):

pd-2(leader):

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[lhy1024]

need to fix

[nolouch]

cc @lhy1024

[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 6a62330