http plug-in problem

[congim]

I tried to run the http instance code，and use wireshark to capture network messages,why didn't i find traceID spanID in the http message?

[congim]

network msg:

GET /hello HTTP/1.1
Host: localhost:7777
User-Agent: Go-http-client/1.1
Accept-Encoding: gzip

HTTP/1.1 200 OK
Date: Thu, 12 Sep 2019 02:17:58 GMT
Content-Length: 14
Content-Type: text/plain; charset=utf-8

Hello, world!

[congim]

I traced the code and found a NoopTracer～ ~,

// Inject does nothing.
func (NoopTracer) Inject(ctx context.Context, span Span, injector Injector) {
}

[congim]

Do I need to implement this tracer myself?

[iredelmeier]

@congim rather than implementing the tracer yourself, you can use the SDK via [Register](https://godoc.org/go.opentelemetry.io/sdk/trace#Register with an exporter registered via RegisterExporter. Currently, the only out-of-the-box exporter is the Jaeger exporter.

Here's a complete example. Hope that helps!

[congim]

@iredelmeier nice, thank you!