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2026-07-29 16:01
REST API

Distributed Tracing

TraceRequestValidateHard
Try Interactive Demo

What you will learn

  • Parse W3C traceparent (version-traceId-spanId-flags) and validate format strictly
  • Propagate trace context across service boundaries — a broken chain kills observability
  • Use trace IDs to correlate API test failures with server logs — your debugging superpower

Description

Propagate trace IDs across service calls.

Test Scenario

const traceId = 'trace-' + Date.now();
const response = await request.get('/api/v1/tracing', {
  headers: { 'X-Request-ID': traceId }
});
expect(response.headers()['x-request-id']).toBe(traceId);
Endpoint/api/v1/tracing

Testing Tips

  • •Send X-Request-ID header
  • •Check X-Request-ID in response
  • •Verify trace spans in logs
// Playwright API Testing - REST
import { test, expect } from '@playwright/test';


test('REST API request', async ({ request }) => {
  const response = await request.get('/api/v1/resource');


  expect(response.ok()).toBeTruthy();
  expect(response.status()).toBe(200);


  const data = await response.json();
  expect(data).toBeDefined();
});

Challenge ID: rest-tracing

2 frameworks available

API Playground

Send requests and inspect responses

Endpoint: /api/v1/tracing

Press Enter to send