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The PSR-7 Bridge

2.7 version

The PSR-7 Bridge

The PSR-7 bridge converts HttpFoundation objects from and to objects implementing HTTP message interfaces defined by the PSR-7.


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

Alternatively, you can clone the https://github.com/symfony/psr-http-message-bridge repository.


If you install this component outside of a Symfony application, you must require the vendor/autoload.php file in your code to enable the class autoloading mechanism provided by Composer. Read this article for more details.

The bridge also needs a PSR-7 implementation to allow converting HttpFoundation objects to PSR-7 objects. It provides native support for Zend Diactoros. Use Composer (zendframework/zend-diactoros on Packagist) or refer to the project documentation to install it.


Converting from HttpFoundation Objects to PSR-7

The bridge provides an interface of a factory called Symfony\Bridge\PsrHttpMessage\HttpMessageFactoryInterface that builds objects implementing PSR-7 interfaces from HttpFoundation objects. It also provide a default implementation using Zend Diactoros internally.

The following code snippet explain how to convert a Symfony\Component\HttpFoundation\Request to a Zend\\Diactoros\\ServerRequest class implementing the Psr\\Http\\Message\\ServerRequestInterface interface:

use Symfony\Bridge\PsrHttpMessage\Factory\DiactorosFactory;
use Symfony\Component\HttpFoundation\Request;

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

$psr7Factory = new DiactorosFactory();
$psrRequest = $psr7Factory->createRequest($symfonyRequest);

And now from a Symfony\Component\HttpFoundation\Response to a Zend\\Diactoros\\Response class implementing the Psr\\Http\\Message\\ResponseInterface interface:

use Symfony\Bridge\PsrHttpMessage\Factory\DiactorosFactory;
use Symfony\Component\HttpFoundation\Response;

$symfonyResponse = new Response('Content');

$psr7Factory = new DiactorosFactory();
$psrResponse = $psr7Factory->createResponse($symfonyResponse);

Converting Objects implementing PSR-7 Interfaces to HttpFoundation

On the other hand, the bridge provide a factory interface called 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 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 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);

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.