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/testmodule4/:id">
        <service class="Magento\TestModule4\Service\V1\DataObjectServiceInterface" method="getData" />
        <resources>
            <resource ref="Magento_TestModule4::resource1" />
        </resources>
    </route>
    <route method="GET" url="/V1/testmodule4/scalar/:id">
        <service class="Magento\TestModule4\Service\V1\DataObjectServiceInterface" method="scalarResponse" />
        <resources>
            <resource ref="Magento_TestModule4::resource1" />
        </resources>
    </route>
    <route method="POST" url="/V1/testmodule4/:id">
        <service class="Magento\TestModule4\Service\V1\DataObjectServiceInterface" method="updateData" />
        <resources>
            <resource ref="Magento_TestModule4::resource2" />
        </resources>
    </route>
    <route method="POST" url="/V1/testmodule4/:id/nested">
        <service class="Magento\TestModule4\Service\V1\DataObjectServiceInterface" method="nestedData" />
        <resources>
            <resource ref="Magento_TestModule4::resource3" />
        </resources>
    </route>
    <route method="POST" url="/V1/testmodule4/extensibleDataObject/:id">
        <service class="Magento\TestModule4\Service\V1\DataObjectServiceInterface" method="extensibleDataObject" />
        <resources>
            <resource ref="Magento_TestModule4::resource3" />
        </resources>
    </route>
</routes>