pkg/httpclient: Fix connection closed while writing or reading

[Xuanwo]

Signed-off-by: Xuanwo github@xuanwo.io

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[codecov]

Codecov Report

Merging #305 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #305   +/-   ##
=======================================
  Coverage   84.41%   84.41%           
=======================================
  Files          12       12           
  Lines         943      943           
=======================================
  Hits          796      796           
  Misses         91       91           
  Partials       56       56           

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