wdengw commented on issue #886: Got IllegalArgumentExceptions when calling 
   The fix does eliminated the exception.   Traces are record and shown on UI.  
But the traces are not able go across distributed services,  it only work for 
local traces.
   I am curious that the 
       public <C> SpanContext extract(Format<C> format, C carrier) {
           return new SkywalkingContext();
   Doesn't take any information form the carrier to create the context.  The 
OpenTracing API spec expect that, for HTTP request, HTTP headers are used to 
pass TraceContext across machines.  How does Skywalking manage to pass 
TraceContext between remote services?

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