SpringCloud/spring-cloud-sleuth
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Sync docs from 2.0.x to gh-pages

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2018-09-07 12:37:38 +00:00
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2.0.x/spring-cloud-sleuth.xml
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@@ -1019,16 +1019,17 @@ The following example shows how to propagate <literal>x-vcap-request-id</literal
.build()
);</programlisting>
<simpara>Later, you can call the following code to affect the country code of the current trace context:</simpara>
<programlisting language="java" linenumbering="unnumbered">ExtraFieldPropagation.set("country-code", "FO");
String countryCode = ExtraFieldPropagation.get("country-code");</programlisting>
<programlisting language="java" linenumbering="unnumbered">ExtraFieldPropagation.set("x-country-code", "FO");
String countryCode = ExtraFieldPropagation.get("x-country-code");</programlisting>
<simpara>Alternatively, if you have a reference to a trace context, you can use it explicitly, as shown in the following example:</simpara>
<programlisting language="java" linenumbering="unnumbered">ExtraFieldPropagation.set(span.context(), "country-code", "FO");
String countryCode = ExtraFieldPropagation.get(span.context(), "country-code");</programlisting>
<programlisting language="java" linenumbering="unnumbered">ExtraFieldPropagation.set(span.context(), "x-country-code", "FO");
String countryCode = ExtraFieldPropagation.get(span.context(), "x-country-code");</programlisting>
<important>
<simpara>A difference from previous versions of Sleuth is that, with Brave, you must pass the list of baggage keys.
There are two properties to achieve this.
With the <literal>spring.sleuth.baggage-keys</literal>, you set keys that get prefixed with <literal>baggage-</literal> for HTTP calls and <literal>baggage_</literal> for messaging.
You can also use the <literal>spring.sleuth.propagation-keys</literal> property to pass a list of prefixed keys that are whitelisted without any prefix.</simpara>
You can also use the <literal>spring.sleuth.propagation-keys</literal> property to pass a list of prefixed keys that are whitelisted without any prefix.
Notice that there&#8217;s no <literal>x-</literal> in front of the header keys.</simpara>
</important>
</section>
<section xml:id="_extracting_a_propagated_context">