more http resp msg in ex

[tg123]

for better debugging

[codecov-commenter]

Codecov Report

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@@            Coverage Diff            @@
##             master    #1326   +/-   ##
=========================================
  Coverage          ?   69.90%           
=========================================
  Files             ?       95           
  Lines             ?     2701           
  Branches          ?        0           
=========================================
  Hits              ?     1888           
  Misses            ?      813           
  Partials          ?        0           

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[brendandburns]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, tg123

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