fix(tracing): Get HTTP headers from span rather than transaction if possible #1035
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Currently, there are situations in which a trace ends up looking not like this (as it should):
but instead looks like this:
This happens because we currently create the outgoing tracing headers based not on the span representing the outgoing request but on whatever span is on the scope, which is most often the transaction itself. There are situations in which this is necessary (if there is no child span to tie to*), but in situations where it's not, we should be correctly associating child transactions with their parent spans, not their ancestor transactions.
*It's a separate question whether, in the one place there isn't a span (here, the
rq
integration), there should be.