# B3 propagation (Zipkin). '#' lines are commentary.
# --- single header: b3: {TraceId}-{SpanId}-{SamplingState}-{ParentSpanId} ---
b3: 4bf92f3577b34da6a3ce929d0e0e4736-2b3c4d5e6f708192-1-00f067aa0ba902b7
b3: 4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-1
b3: 4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-0
# debug flag
b3: 4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-d
# 64-bit trace id (legacy, still legal)
b3: a3ce929d0e0e4736-00f067aa0ba902b7-1
# sampling-only: 'do not trace', with no IDs at all
b3: 0
# --- multi header ---
X-B3-TraceId: 4bf92f3577b34da6a3ce929d0e0e4736
X-B3-SpanId: 2b3c4d5e6f708192
X-B3-ParentSpanId: 00f067aa0ba902b7
X-B3-Sampled: 1
X-B3-Flags: 1
# --- invalid ---
# span id must be 16 hex characters
b3: 4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902-1
# sampling state must be 0, 1 or d
b3: 4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-true