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ResponseInterface.php
01 <?php
02
03 declare(strict_types=1);
04
05 namespace Psr\Http\Message;
06
07 /**
08 * Representation of an outgoing, server-side response.
09 *
10 * Per the HTTP specification, this interface includes properties for
11 * each of the following:
12 *
13 * - Protocol version
14 * - Status code and reason phrase
15 * - Headers
16 * - Message body
17 *
18 * Responses are considered immutable; all methods that might change state MUST
19 * be implemented such that they retain the internal state of the current
20 * message and return an instance that contains the changed state.
21 */
22 interface ResponseInterface extends MessageInterface
23 {
24 /**
25 * Gets the response status code.
26 *
27 * The status code is a 3-digit integer result code of the server's attempt
28 * to understand and satisfy the request.
29 *
30 * @return int Status code.
31 */
32 public function getStatusCode();
33
34 /**
35 * Return an instance with the specified status code and, optionally, reason phrase.
36 *
37 * If no reason phrase is specified, implementations MAY choose to default
38 * to the RFC 7231 or IANA recommended reason phrase for the response's
39 * status code.
40 *
41 * This method MUST be implemented in such a way as to retain the
42 * immutability of the message, and MUST return an instance that has the
43 * updated status and reason phrase.
44 *
45 * @link http://tools.ietf.org/html/rfc7231#section-6
46 * @link http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
47 * @param int $code The 3-digit integer result code to set.
48 * @param string $reasonPhrase The reason phrase to use with the
49 * provided status code; if none is provided, implementations MAY
50 * use the defaults as suggested in the HTTP specification.
51 * @return static
52 * @throws \InvalidArgumentException For invalid status code arguments.
53 */
54 public function withStatus(int $code, string $reasonPhrase = '');
55
56 /**
57 * Gets the response reason phrase associated with the status code.
58 *
59 * Because a reason phrase is not a required element in a response
60 * status line, the reason phrase value MAY be null. Implementations MAY
61 * choose to return the default RFC 7231 recommended reason phrase (or those
62 * listed in the IANA HTTP Status Code Registry) for the response's
63 * status code.
64 *
65 * @link http://tools.ietf.org/html/rfc7231#section-6
66 * @link http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
67 * @return string Reason phrase; must return an empty string if none present.
68 */
69 public function getReasonPhrase();
70 }
71