<?php

namespace PSX\Http;

/**
 * This is a mutable version of the PSR HTTP message interface
 *
 * Per the HTTP specification, this interface includes properties for
 * each of the following:
 *
 * - Protocol version
 * - Status code and reason phrase
 * - Headers
 * - Message body
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 * @see     https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-7-http-message.md
 */
interface ResponseInterface extends MessageInterface
{
    /**
     * Gets the response status code. The status code is a 3-digit integer
     * result code of the server's attempt to understand and satisfy the request
     *
     * @return integer
     */
    public function getStatusCode();

    /**
     * Gets the response reason phrase, a short textual description of the
     * status code.
     *
     * @link http://tools.ietf.org/html/rfc7231#section-6
     * @link http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
     * @return string|null
     */
    public function getReasonPhrase();

    /**
     * Sets the specified status code, and optionally reason phrase, for the
     * response
     *
     * @link http://tools.ietf.org/html/rfc7231#section-6
     * @link http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
     * @param int $code
     * @param null|string $reasonPhrase
     * @return void
     * @throws \InvalidArgumentException
     */
    public function setStatus($code, $reasonPhrase = null);
}
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