It requires the following features: p:http-request.
The pipeline
<p:declare-step xmlns:c="http://www.w3.org/ns/xproc-step" xmlns:err="http://www.w3.org/ns/xproc-error" xmlns:p="http://www.w3.org/ns/xproc" xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-inline-prefixes="c xs" version="3.0">
<p:output port="result"/>
<p:option name="WHOST" select="'http://localhost:8246'" static="true"/>
<p:http-request method="get" href="{$WHOST}/service/slow" parameters="map{'timeout': 2, 'fail-on-timeout': true()}">
<p:with-input>
<p:empty/>
</p:with-input>
</p:http-request>
<p:identity>
<p:with-input pipe="report"/>
</p:identity>
</p:declare-step>
