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.. index::
   single: PSR-7

The PSR-7 Bridge

The PSR-7 bridge converts :doc:`HttpFoundation </components/http_foundation>` objects from and to objects implementing HTTP message interfaces defined by the PSR-7.

Installation

$ composer require symfony/psr-http-message-bridge

The bridge also needs a PSR-7 and PSR-17 implementation to convert HttpFoundation objects to PSR-7 objects. The following command installs the nyholm/psr7 library, a lightweight and fast PSR-7 implementation, but you can use any of the libraries that implement psr/http-factory-implementation:

$ composer require nyholm/psr7

Usage

Converting from HttpFoundation Objects to PSR-7

The bridge provides an interface of a factory called :class:`Symfony\\Bridge\\PsrHttpMessage\\HttpMessageFactoryInterface` that builds objects implementing PSR-7 interfaces from HttpFoundation objects.

The following code snippet explains how to convert a :class:`Symfony\\Component\\HttpFoundation\\Request` to a Nyholm\Psr7\ServerRequest class implementing the Psr\Http\Message\ServerRequestInterface interface:

use Nyholm\Psr7\Factory\Psr17Factory;
use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;
use Symfony\Component\HttpFoundation\Request;

$symfonyRequest = new Request([], [], [], [], [], ['HTTP_HOST' => 'dunglas.fr'], 'Content');
// The HTTP_HOST server key must be set to avoid an unexpected error

$psr17Factory = new Psr17Factory();
$psrHttpFactory = new PsrHttpFactory($psr17Factory, $psr17Factory, $psr17Factory, $psr17Factory);
$psrRequest = $psrHttpFactory->createRequest($symfonyRequest);

And now from a :class:`Symfony\\Component\\HttpFoundation\\Response` to a Nyholm\Psr7\Response class implementing the Psr\Http\Message\ResponseInterface interface:

use Nyholm\Psr7\Factory\Psr17Factory;
use Symfony\Bridge\PsrHttpMessage\Factory\PsrHttpFactory;
use Symfony\Component\HttpFoundation\Response;

$symfonyResponse = new Response('Content');

$psr17Factory = new Psr17Factory();
$psrHttpFactory = new PsrHttpFactory($psr17Factory, $psr17Factory, $psr17Factory, $psr17Factory);
$psrResponse = $psrHttpFactory->createResponse($symfonyResponse);

Converting Objects implementing PSR-7 Interfaces to HttpFoundation

On the other hand, the bridge provide a factory interface called :class:`Symfony\\Bridge\\PsrHttpMessage\\HttpFoundationFactoryInterface` that builds HttpFoundation objects from objects implementing PSR-7 interfaces.

The next snippet explain how to convert an object implementing the Psr\Http\Message\ServerRequestInterface interface to a :class:`Symfony\\Component\\HttpFoundation\\Request` instance:

use Symfony\Bridge\PsrHttpMessage\Factory\HttpFoundationFactory;

// $psrRequest is an instance of Psr\Http\Message\ServerRequestInterface

$httpFoundationFactory = new HttpFoundationFactory();
$symfonyRequest = $httpFoundationFactory->createRequest($psrRequest);

From an object implementing the Psr\Http\Message\ResponseInterface to a :class:`Symfony\\Component\\HttpFoundation\\Response` instance:

use Symfony\Bridge\PsrHttpMessage\Factory\HttpFoundationFactory;

// $psrResponse is an instance of Psr\Http\Message\ResponseInterface

$httpFoundationFactory = new HttpFoundationFactory();
$symfonyResponse = $httpFoundationFactory->createResponse($psrResponse);