Microserviceshard

Trace context propagation: what is the `traceparent` header and why should services forward it?

Answer

`traceparent` is the W3C Trace Context header that carries the trace ID and parent span info across hops. If every service forwards it to downstream calls, you can connect logs/spans into one end-to-end trace and debug latency/failures across many services.

GET /api/orders/123 HTTP/1.1
traceparent: 00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01

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