wdengw commented on issue #886: Got IllegalArgumentExceptions when calling 
   I am using the 3.2.6 version.  I tried to make the same code changes locally 
but found that on 3.2.6 version, SkywalkingTracerExtractInterceptor.java 
doesn't reference TextMapContext at all.  Please advice how to make the changes 
on 3.2.6.  
   A side question:  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 services?

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