di.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Framework\App\FrontControllerInterface" type="Magento\GraphQl\Controller\GraphQl" />
    <type name="Magento\Authorization\Model\CompositeUserContext">
        <arguments>
            <argument name="userContexts" xsi:type="array">
                <item name="tokenUserContext" xsi:type="array">
                    <item name="type" xsi:type="object">Magento\Webapi\Model\Authorization\TokenUserContext</item>
                    <item name="sortOrder" xsi:type="string">10</item>
                </item>
                <item name="oauthUserContext" xsi:type="array">
                    <item name="type" xsi:type="object">Magento\Webapi\Model\Authorization\OauthUserContext</item>
                    <item name="sortOrder" xsi:type="string">40</item>
                </item>
                <item name="guestUserContext" xsi:type="array">
                    <item name="type" xsi:type="object">Magento\Webapi\Model\Authorization\GuestUserContext</item>
                    <item name="sortOrder" xsi:type="string">100</item>
                </item>
            </argument>
        </arguments>
    </type>
    <type name="Magento\GraphQl\Controller\HttpRequestProcessor">
        <arguments>
            <argument name="graphQlHeaders" xsi:type="array">
                <item name="Content-Type" xsi:type="object">Magento\GraphQl\Controller\HttpHeaderProcessor\ContentTypeProcessor</item>
                <item name="Store" xsi:type="object">Magento\GraphQl\Controller\HttpHeaderProcessor\StoreProcessor</item>
            </argument>
        </arguments>
    </type>
</config>