webapi.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Webapi:etc/webapi.xsd">
    <route method="GET" url="/V1/testModule2SubsetRest/:id">
        <service class="Magento\TestModule2\Service\V1\SubsetRestInterface" method="item" />
        <resources>
            <resource ref="Magento_TestModule2::resource1" />
        </resources>
    </route>
    <route method="GET" url="/V1/testModule2SubsetRest">
        <service class="Magento\TestModule2\Service\V1\SubsetRestInterface" method="items" />
        <resources>
            <resource ref="Magento_TestModule2::resource2" />
            <resource ref="Magento_TestModule2::resource3" />
        </resources>
    </route>
</routes>