Collect custom HTTP headers #142
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This PR introduces the HTTP header collection feature to the HTTP instrumentation wrappers. Both request and response headers defined either in the
(instana.TracerOptions).CollectableHTTPHeadersprovided toinstana.InitSensor()or theextra-http-headersfiled ofcom.instana.tracingsection of the Host Agent Configuration file are now attached to the request/response span and sent to the host agent for collection.Closes #64