hertz 集成OpenTelemetry 以后，response header 里面不会自动设置 traceId 吗

[whtis]

rt，目前配置好了OpenTelemetry，日志里也会有 traceId，但是 http response 请求头里没有 traceId 相关的信息。想问下如果想加的话，应该怎么做

[dzy176]

use middleware to inject trace_id to your response header

// define your middleware
func TraceIdMiddleware() app.HandlerFunc {
	return func(ctx context.Context, c *app.RequestContext) {
		span := trace.SpanFromContext(ctx)
		if span != nil {
			c.Header("trace-id", span.SpanContext().TraceID().String())
		}
		c.Next(ctx) // call the next middleware(handler)
	}
}



func main() {
	h := server.Default()
	h.Use(tracing.ServerMiddleware(cfg))
	// use your middleware after tracing middleware
	h.Use(TraceIdMiddleware())
}

test:

curl 127.0.0.1:8083/ping -i
HTTP/1.1 200 OK
Server: hertz
Date: Mon, 31 Mar 2025 12:08:20 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 18
Trace-Id: 3c17958a1757cfa9f260b253ab145bc4

{"message":"pong"}

[whtis]

use middleware to inject trace_id to your response header

// define your middleware
func TraceIdMiddleware() app.HandlerFunc {
return func(ctx context.Context, c *app.RequestContext) {
span := trace.SpanFromContext(ctx)
if span != nil {
c.Header("trace-id", span.SpanContext().TraceID().String())
}
c.Next(ctx) // call the next middleware(handler)
}
}

func main() {
h := server.Default()
h.Use(tracing.ServerMiddleware(cfg))
// use your middleware after tracing middleware
h.Use(TraceIdMiddleware())
}
test:

curl 127.0.0.1:8083/ping -i
HTTP/1.1 200 OK
Server: hertz
Date: Mon, 31 Mar 2025 12:08:20 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 18
Trace-Id: 3c17958a1757cfa9f260b253ab145bc4

{"message":"pong"}

赞，这个能力居然没有集成到 hertz 当中，感觉这个算是个很有用的 feature