http4k / org.http4k.filter / ClientFilters / RequestTracing
fun RequestTracing(startReportFn: (Request, ZipkinTraces) -> Unit = { _, _ -> }, endReportFn: (Request, Response, ZipkinTraces) -> Unit = { _, _, _ -> }): Filter
Adds Zipkin request tracing headers to the outbound request. (traceid, spanid, parentspanid)