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<title>5.&nbsp;Propagation</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="up" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="prev" href="multi__sampling.html" title="4.&nbsp;Sampling"><link rel="next" href="multi__current_tracing_component.html" title="6.&nbsp;Current Tracing Component"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.&nbsp;Propagation</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__sampling.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__current_tracing_component.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_propagation" href="#_propagation"></a>5.&nbsp;Propagation</h1></div></div></div><p>Propagation is needed to ensure activities originating from the same root are collected together in the same trace.
<title>5.&nbsp;Propagation</title><link rel="stylesheet" type="text/css" href="css/manual-multipage.css"><meta name="generator" content="DocBook XSL Stylesheets V1.79.1"><link rel="home" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="up" href="multi_spring-cloud-sleuth.html" title="Spring Cloud Sleuth"><link rel="prev" href="multi__sampling.html" title="4.&nbsp;Sampling"><link rel="next" href="multi__current_tracing_component.html" title="6.&nbsp;Current Tracing Component"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">5.&nbsp;Propagation</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="multi__sampling.html">Prev</a>&nbsp;</td><th width="60%" align="center">&nbsp;</th><td width="20%" align="right">&nbsp;<a accesskey="n" href="multi__current_tracing_component.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="_propagation" href="#_propagation"></a>5.&nbsp;Propagation</h1></div></div></div><p>Propagation is needed to ensure activities originating from the same root are collected together in the same trace.
The most common propagation approach is to copy a trace context from a client by sending an RPC request to a server receiving it.</p><p>For example, when a downstream HTTP call is made, its trace context is encoded as request headers and sent along with it, as shown in the following image:</p><pre class="screen"> Client Span Server Span
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