Adding fix for issue #1967

[blperf]

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[blueww]

/azp run

[EmmaZhu]

Could you share how you select this number?

[EmmaZhu]

Mainly the change looks good to me. We may need to do some test first

@blperf blperf , it'd be really helpful if you could share tests you have done.

[EmmaZhu]

Tried with downloading a 8G file multiple times, but seems still meet the hang issue.

[blueww]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).