fix(tracer): forward X-Amzn-Trace-Id
header when instrumenting fetch
#3470
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Summary
Changes
This PR updates the implementation of the global fetch instrumentation in Tracer so that the
X-Amzn-Trace-Id
header is automatically populated and added to requests when Tracer is enabled.This allows X-Ray to attribute the segment/span to the correct parent and build the correct service map for a request.
Prior to this PR the header was not added and this resulted in disjointed traces. This happened only when using the Fetch API, but not when using the
https
module - which is why this is considered a bug.The linked issue contains more info on why we did not add this in the first place and what was missing.
Issue number: fixes #3467
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