What makes a traceparent header invalid under W3C Trace Context specifications?

A traceparent is invalid if it contains non-hex characters, uppercase letters, incorrect segment lengths, version ff, or all-zero trace and parent IDs.

How many members are permitted in a W3C tracestate header?

A tracestate header can hold a maximum of 32 comma-separated key=value entries, each with opaque values up to 256 printable characters.

What format is required for the grpc-trace-context-bin header?

It must decode from base64 to exactly 25 bytes consisting of a 16-byte trace-id, an 8-byte span-id, and a 1-byte trace-flags field.

Which Content-Type header must be used for OTLP Protobuf over HTTP?

Binary Protobuf exports over HTTP must specify Content-Type: application/x-protobuf, whereas JSON exports require application/json.

How does the correlation check verify multi-hop trace propagation?

It checks that the 16-byte trace-id remains constant between hops while verifying that the child span-id is non-zero and does not collide with the parent.

OpenTelemetry W3C traceparent / tracestate / baggage + OTLP Header Propagation Validator | Online Free Tool

OpenTelemetry W3C traceparent / tracestate / baggage + OTLP Header Propagation Validator | Online Free Tool | Elysia Tools

Examples

1. Validating gRPC Propagator Context and Correlation

Backend Infrastructure Engineer

Background

A platform team is rolling out an internal gRPC service mesh and needs to verify that distributed trace context propagates correctly between services.

Problem

Distributed traces were fragmenting across service boundaries due to mismatched binary context headers and unverified child span propagation.

How to use

Input the primary traceparent, provide the base64 grpc-trace-context-bin string, set transport to gRPC, and supply the second downstream traceparent.

traceparent: 00-4bf92f3577b34da6a3ce929d0e0e4736-00f067aa0ba902b7-01
transport: grpc
contentType: application/x-protobuf
grpcTraceContextBin: S/kvNXezTaajzpKdDg5HNgDwZ6oLqQK3AQ==
secondTraceparent: 00-4bf92f3577b34da6a3ce929d0e0e4736-aabbccddeeff0011-01

Outcome

Verifies that the 25-byte binary context matches the traceparent and confirms trace-id stability across the downstream hop without span collisions.

2. Catching Malformed Baggage and Invalid Trace Identifiers

Site Reliability Engineer

Background

An SRE is investigating trace ingestion rejections within an OpenTelemetry Collector pipeline handling incoming HTTP exports.

Problem

Upstream microservices were generating invalid all-zero trace IDs, raw whitespace in baggage headers, and an incorrect text/plain content type.

How to use

Paste the suspect traceparent, tracestate, and baggage headers into the validator and specify transport as HTTP with the observed Content-Type.

traceparent: 00-00000000000000000000000000000000-ABCDEF12ABCDEF12-03
tracestate: dup=1,dup=2,bad key
baggage: userId==alice;=novalue
transport: http
contentType: text/plain

Outcome

Flags the all-zero trace ID, uppercase hex warning, invalid baggage delimiters, duplicate tracestate keys, and unsupported export Content-Type.

OpenTelemetry W3C traceparent / tracestate / baggage + OTLP Header Propagation Validator

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Use cases

Examples

1. Validating gRPC Propagator Context and Correlation

2. Catching Malformed Baggage and Invalid Trace Identifiers

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