File: vendor/sensio/framework-extra-bundle/Resources/config/psr7.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>
        <service id="sensio_framework_extra.psr7.http_message_factory" class="Symfony\Bridge\PsrHttpMessage\Factory\DiactorosFactory" public="false" />
        <service id="sensio_framework_extra.psr7.http_foundation_factory" class="Symfony\Bridge\PsrHttpMessage\Factory\HttpFoundationFactory" public="false" />

        <service id="sensio_framework_extra.psr7.converter.server_request" class="Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\PsrServerRequestParamConverter">
            <argument type="service" id="sensio_framework_extra.psr7.http_message_factory" />

            <tag name="request.param_converter" converter="psr.server_request" />
        </service>

        <service id="sensio_framework_extra.psr7.listener.response" class="Sensio\Bundle\FrameworkExtraBundle\EventListener\PsrResponseListener">
            <argument type="service" id="sensio_framework_extra.psr7.http_foundation_factory" />

            <tag name="kernel.event_subscriber" />
        </service>
    </services>
</container>