spacewander commented on issue #7795:
URL: https://github.com/apache/apisix/issues/7795#issuecomment-1229881278

   I got your point.
   Here we delete b3 header in 
https://github.com/apache/apisix/blob/cffa4b69f9080707d100fbe856f251054cc8cba4/apisix/plugins/zipkin.lua#L130
 because at that time not every upstream supports the b3 header so I choose to 
convert it to the old format `x-b3-xxx` headers.
   Obviously, we didn't set the `x-b3-xxxid` headers like what we have done in 
https://github.com/apache/apisix/blob/cffa4b69f9080707d100fbe856f251054cc8cba4/apisix/plugins/zipkin/codec.lua#L96,
 when the sample is disabled.


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