30 lines
560 B
Go
30 lines
560 B
Go
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package main
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import (
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"context"
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"fmt"
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)
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func main() {
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traceCtx := context.WithValue(context.Background(), "trace_id", "12-21-33")
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makeRequest(traceCtx)
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oldValue, ok := traceCtx.Value("trace_id").(string)
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if ok {
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fmt.Println("mainValue", oldValue)
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}
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}
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func makeRequest(ctx context.Context) {
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oldValue, ok := ctx.Value("trace_id").(string)
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if ok {
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fmt.Println("oldValue", oldValue)
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}
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newCtx := context.WithValue(ctx, "trace_id", "22-22-22")
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newValue, ok := newCtx.Value("trace_id").(string)
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if ok {
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fmt.Println("newValue", newValue)
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}
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}
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