Hi the SkyWalking community: I'm writing to let you know that now we have stopped supporting the legacy protocol between agent and backend[1], a.k.a protocol v1, or header that is named with `sw3`, this will be included in the next release 7.0.0, and we suggest to upgrade to the latest (v2) protocol ASAP.
[1] https://github.com/apache/skywalking/pull/4244 -- GitHub @kezhenxu94 Apache SkyWalking, Apache Dubbo
