Cherry-pick #18327 to 7.x: [Heartbeat] Capture HTTP headers#19057

Merged

andrewvc merged 1 commit intoelastic:7.xfrom andrewvc:backport_18327_7.x

Jun 9, 2020

+151-50

Commits on Jun 9, 2020

[Heartbeat] Capture HTTP headers (elastic#18327 )
andrewvc
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