Requests, responses and the PHP SAPI

On the PHP SAPI side, sabre/http basically wraps a number of concepts in PHP:

• $_SERVER,
• $_POST,
• $_GET,
• $_FILES,
• php://input,
• echo(),
• header(),
• php://output.

Effectively, it provides an OOP wrapper around these things. Half of these items relate the HTTP request, and the other half to the HTTP response.

The easiest way to instantiate a request object is as follows:

use Sabre\HTTP;

include 'vendor/autoload.php';

$request = HTTP\Sapi::getRequest();

This line should only happen once in your entire application. Everywhere else you should pass this request object around.

You should always typehint on its interface:

function handleRequest(HTTP\RequestInterface $request) {

    // Do something with this request :)

}

You can create a response object as such:

use Sabre\HTTP;

include 'vendor/autoload.php';

$response = new HTTP\Response();
$response->setStatus(201); // created!
$response->setHeader('X-Foo', 'bar');
$response->setBody(
    'success!'
);

After you have fully constructed your response, you must call:

HTTP\Sapi::sendResponse($response);

This line should generally also appear once in your application (at the very end).