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Traceparent header is duplicated #1648

@kessl

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@kessl

Hello, I'm seeing two Traceparent headers on requests coming out of an OBI-instrumented reverse proxy, similar to this issue: #976 Requests forwarded by the proxy have an OBI-generated traceparent in addition to the traceparent of the incoming request.

I first encountered this by running Beyla on a newly scaffolded Rails app, which used the Thruster reverse proxy running in the same container as the app webserver. When I replaced Thruster with Caddy, header was not duplicated.

Reproduced using a Go reverse proxy: https://github.com/kessl/obi-duplicate-traceparent

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