title: Do we have to pass header values from WebClient in Zipkins
body: <p>I am using Spring boot and following libraries in client and server,</p>
  
  <pre><code>dependencyManagement {
      imports {
          mavenBom "org.springframework.cloud:spring-cloud-dependencies:Finchley.SR2"
      }
  }
   // Spring Cloud Sleuth
      compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-sleuth', version: '2.0.1.RELEASE'
      compile group: 'org.springframework.cloud', name: 'spring-cloud-starter-zipkin', version: '2.0.1.RELEASE'
  </code></pre>
  
  <p>Based upon  spring documentation, "<a href="https://cloud.spring.io/spring-cloud-sleuth/" rel="nofollow noreferrer">https://cloud.spring.io/spring-cloud-sleuth/</a>"</p>
  
  <p>Run this app and then hit the home page. You will see traceId and spanId populated in the logs. If this app calls out to another one (e.g. with RestTemplate) it will send the trace data in headers and if the receiver is another Sleuth app you will see the trace continue there.</p>
  
  <p>How will this work with Spring5 web client?</p>