elasticapm/instrumentation/packages/httpx/async/httpcore.py [70:88]:
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            signature,
            span_type="external",
            span_subtype="http",
            extra={"http": {"url": url}},
            leaf=True,
        ) as span:
            # if httpcore has been called in a leaf span, this span might be a DroppedSpan.
            leaf_span = span
            while isinstance(leaf_span, DroppedSpan):
                leaf_span = leaf_span.parent

            if headers is not None:
                # It's possible that there are only dropped spans, e.g. if we started dropping spans due to the
                # transaction_max_spans limit. In this case, the transaction.id is used
                parent_id = leaf_span.id if leaf_span else transaction.id
                trace_parent = transaction.trace_parent.copy_from(
                    span_id=parent_id, trace_options=TracingOptions(recorded=True)
                )
                utils.set_disttracing_headers(headers, trace_parent, transaction)
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elasticapm/instrumentation/packages/httpx/sync/httpcore.py [60:78]:
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            signature,
            span_type="external",
            span_subtype="http",
            extra={"http": {"url": url}},
            leaf=True,
        ) as span:
            # if httpcore has been called in a leaf span, this span might be a DroppedSpan.
            leaf_span = span
            while isinstance(leaf_span, DroppedSpan):
                leaf_span = leaf_span.parent

            if headers is not None:
                # It's possible that there are only dropped spans, e.g. if we started dropping spans.
                # In this case, the transaction.id is used
                parent_id = leaf_span.id if leaf_span else transaction.id
                trace_parent = transaction.trace_parent.copy_from(
                    span_id=parent_id, trace_options=TracingOptions(recorded=True)
                )
                utils.set_disttracing_headers(headers, trace_parent, transaction)
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