Imports github.com/opentracing/opentracing-go github.com/openzipkin/zipkin-go-opentracing github.com/openzipkin/zipkin-go-opentracing/examples/cli_with_2_services/svc1 github.com/openzipkin/zipkin-go-opentracing/examples/cli_with_2_services/svc2 Standard library imports fmt net/http os