in geronimo-opentracing-common/src/main/java/org/apache/geronimo/microprofile/opentracing/common/microprofile/zipkin/ZipkinHttp.java [179:187]
private void doSend(final List<ZipkinSpan> copy) {
final Response result = client.target(collector)
.request()
.post(entity(copy, APPLICATION_JSON_TYPE));
if (result.getStatus() >= 300) {
// todo: better handling but at least log them to not loose them completely or explode in memory
throw new IllegalStateException("Can't send to zipkin: " + copy);
}
}