The following array is extracted from the Response php just to check out the HTTP status codes.
public static $statusTexts = [
100 => 'Continue',
101 => 'Switching Protocols',
102 => 'Processing', // RFC2518
103 => 'Early Hints',
200 => 'OK',
201 => 'Created',
202 => 'Accepted',
203 => 'Non-Authoritative Information',
204 => 'No Content',
205 => 'Reset Content',
206 => 'Partial Content',
207 => 'Multi-Status', // RFC4918
208 => 'Already Reported', // RFC5842
226 => 'IM Used', // RFC3229
300 => 'Multiple Choices',
301 => 'Moved Permanently',
302 => 'Found',
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
307 => 'Temporary Redirect',
308 => 'Permanent Redirect', // RFC7238
400 => 'Bad Request',
401 => 'Unauthorized',
402 => 'Payment Required',
403 => 'Forbidden',
404 => 'Not Found',
405 => 'Method Not Allowed',
406 => 'Not Acceptable',
407 => 'Proxy Authentication Required',
408 => 'Request Timeout',
409 => 'Conflict',
410 => 'Gone',
411 => 'Length Required',
412 => 'Precondition Failed',
413 => 'Content Too Large', // RFC-ietf-httpbis-semantics
414 => 'URI Too Long',
415 => 'Unsupported Media Type',
416 => 'Range Not Satisfiable',
417 => 'Expectation Failed',
418 => 'I\'m a teapot', // RFC2324
421 => 'Misdirected Request', // RFC7540
422 => 'Unprocessable Content', // RFC-ietf-httpbis-semantics
423 => 'Locked', // RFC4918
424 => 'Failed Dependency', // RFC4918
425 => 'Too Early', // RFC-ietf-httpbis-replay-04
426 => 'Upgrade Required', // RFC2817
428 => 'Precondition Required', // RFC6585
429 => 'Too Many Requests', // RFC6585
431 => 'Request Header Fields Too Large', // RFC6585
451 => 'Unavailable For Legal Reasons', // RFC7725
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway',
503 => 'Service Unavailable',
504 => 'Gateway Timeout',
505 => 'HTTP Version Not Supported',
506 => 'Variant Also Negotiates', // RFC2295
507 => 'Insufficient Storage', // RFC4918
508 => 'Loop Detected', // RFC5842
510 => 'Not Extended', // RFC2774
511 => 'Network Authentication Required', // RFC6585
];
Below given is Laravel's Response.php file:
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\HttpFoundation;
// Help opcache.preload discover always-needed symbols
class_exists(ResponseHeaderBag::class);
/**
* Response represents an HTTP response.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class Response
{
public const HTTP_CONTINUE = 100;
public const HTTP_SWITCHING_PROTOCOLS = 101;
public const HTTP_PROCESSING = 102; // RFC2518
public const HTTP_EARLY_HINTS = 103; // RFC8297
public const HTTP_OK = 200;
public const HTTP_CREATED = 201;
public const HTTP_ACCEPTED = 202;
public const HTTP_NON_AUTHORITATIVE_INFORMATION = 203;
public const HTTP_NO_CONTENT = 204;
public const HTTP_RESET_CONTENT = 205;
public const HTTP_PARTIAL_CONTENT = 206;
public const HTTP_MULTI_STATUS = 207; // RFC4918
public const HTTP_ALREADY_REPORTED = 208; // RFC5842
public const HTTP_IM_USED = 226; // RFC3229
public const HTTP_MULTIPLE_CHOICES = 300;
public const HTTP_MOVED_PERMANENTLY = 301;
public const HTTP_FOUND = 302;
public const HTTP_SEE_OTHER = 303;
public const HTTP_NOT_MODIFIED = 304;
public const HTTP_USE_PROXY = 305;
public const HTTP_RESERVED = 306;
public const HTTP_TEMPORARY_REDIRECT = 307;
public const HTTP_PERMANENTLY_REDIRECT = 308; // RFC7238
public const HTTP_BAD_REQUEST = 400;
public const HTTP_UNAUTHORIZED = 401;
public const HTTP_PAYMENT_REQUIRED = 402;
public const HTTP_FORBIDDEN = 403;
public const HTTP_NOT_FOUND = 404;
public const HTTP_METHOD_NOT_ALLOWED = 405;
public const HTTP_NOT_ACCEPTABLE = 406;
public const HTTP_PROXY_AUTHENTICATION_REQUIRED = 407;
public const HTTP_REQUEST_TIMEOUT = 408;
public const HTTP_CONFLICT = 409;
public const HTTP_GONE = 410;
public const HTTP_LENGTH_REQUIRED = 411;
public const HTTP_PRECONDITION_FAILED = 412;
public const HTTP_REQUEST_ENTITY_TOO_LARGE = 413;
public const HTTP_REQUEST_URI_TOO_LONG = 414;
public const HTTP_UNSUPPORTED_MEDIA_TYPE = 415;
public const HTTP_REQUESTED_RANGE_NOT_SATISFIABLE = 416;
public const HTTP_EXPECTATION_FAILED = 417;
public const HTTP_I_AM_A_TEAPOT = 418; // RFC2324
public const HTTP_MISDIRECTED_REQUEST = 421; // RFC7540
public const HTTP_UNPROCESSABLE_ENTITY = 422; // RFC4918
public const HTTP_LOCKED = 423; // RFC4918
public const HTTP_FAILED_DEPENDENCY = 424; // RFC4918
public const HTTP_TOO_EARLY = 425; // RFC-ietf-httpbis-replay-04
public const HTTP_UPGRADE_REQUIRED = 426; // RFC2817
public const HTTP_PRECONDITION_REQUIRED = 428; // RFC6585
public const HTTP_TOO_MANY_REQUESTS = 429; // RFC6585
public const HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE = 431; // RFC6585
public const HTTP_UNAVAILABLE_FOR_LEGAL_REASONS = 451; // RFC7725
public const HTTP_INTERNAL_SERVER_ERROR = 500;
public const HTTP_NOT_IMPLEMENTED = 501;
public const HTTP_BAD_GATEWAY = 502;
public const HTTP_SERVICE_UNAVAILABLE = 503;
public const HTTP_GATEWAY_TIMEOUT = 504;
public const HTTP_VERSION_NOT_SUPPORTED = 505;
public const HTTP_VARIANT_ALSO_NEGOTIATES_EXPERIMENTAL = 506; // RFC2295
public const HTTP_INSUFFICIENT_STORAGE = 507; // RFC4918
public const HTTP_LOOP_DETECTED = 508; // RFC5842
public const HTTP_NOT_EXTENDED = 510; // RFC2774
public const HTTP_NETWORK_AUTHENTICATION_REQUIRED = 511; // RFC6585
/**
* @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
*/
private const HTTP_RESPONSE_CACHE_CONTROL_DIRECTIVES = [
'must_revalidate' => false,
'no_cache' => false,
'no_store' => false,
'no_transform' => false,
'public' => false,
'private' => false,
'proxy_revalidate' => false,
'max_age' => true,
's_maxage' => true,
'immutable' => false,
'last_modified' => true,
'etag' => true,
];
/**
* @var ResponseHeaderBag
*/
public $headers;
/**
* @var string
*/
protected $content;
/**
* @var string
*/
protected $version;
/**
* @var int
*/
protected $statusCode;
/**
* @var string
*/
protected $statusText;
/**
* @var string
*/
protected $charset;
/**
* Status codes translation table.
*
* The list of codes is complete according to the
* {@link https://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml Hypertext Transfer Protocol (HTTP) Status Code Registry}
* (last updated 2021-10-01).
*
* Unless otherwise noted, the status code is defined in RFC2616.
*
* @var array
*/
public static $statusTexts = [
100 => 'Continue',
101 => 'Switching Protocols',
102 => 'Processing', // RFC2518
103 => 'Early Hints',
200 => 'OK',
201 => 'Created',
202 => 'Accepted',
203 => 'Non-Authoritative Information',
204 => 'No Content',
205 => 'Reset Content',
206 => 'Partial Content',
207 => 'Multi-Status', // RFC4918
208 => 'Already Reported', // RFC5842
226 => 'IM Used', // RFC3229
300 => 'Multiple Choices',
301 => 'Moved Permanently',
302 => 'Found',
303 => 'See Other',
304 => 'Not Modified',
305 => 'Use Proxy',
307 => 'Temporary Redirect',
308 => 'Permanent Redirect', // RFC7238
400 => 'Bad Request',
401 => 'Unauthorized',
402 => 'Payment Required',
403 => 'Forbidden',
404 => 'Not Found',
405 => 'Method Not Allowed',
406 => 'Not Acceptable',
407 => 'Proxy Authentication Required',
408 => 'Request Timeout',
409 => 'Conflict',
410 => 'Gone',
411 => 'Length Required',
412 => 'Precondition Failed',
413 => 'Content Too Large', // RFC-ietf-httpbis-semantics
414 => 'URI Too Long',
415 => 'Unsupported Media Type',
416 => 'Range Not Satisfiable',
417 => 'Expectation Failed',
418 => 'I\'m a teapot', // RFC2324
421 => 'Misdirected Request', // RFC7540
422 => 'Unprocessable Content', // RFC-ietf-httpbis-semantics
423 => 'Locked', // RFC4918
424 => 'Failed Dependency', // RFC4918
425 => 'Too Early', // RFC-ietf-httpbis-replay-04
426 => 'Upgrade Required', // RFC2817
428 => 'Precondition Required', // RFC6585
429 => 'Too Many Requests', // RFC6585
431 => 'Request Header Fields Too Large', // RFC6585
451 => 'Unavailable For Legal Reasons', // RFC7725
500 => 'Internal Server Error',
501 => 'Not Implemented',
502 => 'Bad Gateway',
503 => 'Service Unavailable',
504 => 'Gateway Timeout',
505 => 'HTTP Version Not Supported',
506 => 'Variant Also Negotiates', // RFC2295
507 => 'Insufficient Storage', // RFC4918
508 => 'Loop Detected', // RFC5842
510 => 'Not Extended', // RFC2774
511 => 'Network Authentication Required', // RFC6585
];
/**
* @throws \InvalidArgumentException When the HTTP status code is not valid
*/
public function __construct(?string $content = '', int $status = 200, array $headers = [])
{
$this->headers = new ResponseHeaderBag($headers);
$this->setContent($content);
$this->setStatusCode($status);
$this->setProtocolVersion('1.0');
}
/**
* Returns the Response as an HTTP string.
*
* The string representation of the Response is the same as the
* one that will be sent to the client only if the prepare() method
* has been called before.
*
* @see prepare()
*/
public function __toString(): string
{
return
sprintf('HTTP/%s %s %s', $this->version, $this->statusCode, $this->statusText)."\r\n".
$this->headers."\r\n".
$this->getContent();
}
/**
* Clones the current Response instance.
*/
public function __clone()
{
$this->headers = clone $this->headers;
}
/**
* Prepares the Response before it is sent to the client.
*
* This method tweaks the Response to ensure that it is
* compliant with RFC 2616. Most of the changes are based on
* the Request that is "associated" with this Response.
*
* @return $this
*/
public function prepare(Request $request): static
{
$headers = $this->headers;
if ($this->isInformational() || $this->isEmpty()) {
$this->setContent(null);
$headers->remove('Content-Type');
$headers->remove('Content-Length');
// prevent PHP from sending the Content-Type header based on default_mimetype
ini_set('default_mimetype', '');
} else {
// Content-type based on the Request
if (!$headers->has('Content-Type')) {
$format = $request->getRequestFormat(null);
if (null !== $format && $mimeType = $request->getMimeType($format)) {
$headers->set('Content-Type', $mimeType);
}
}
// Fix Content-Type
$charset = $this->charset ?: 'UTF-8';
if (!$headers->has('Content-Type')) {
$headers->set('Content-Type', 'text/html; charset='.$charset);
} elseif (0 === stripos($headers->get('Content-Type'), 'text/') && false === stripos($headers->get('Content-Type'), 'charset')) {
// add the charset
$headers->set('Content-Type', $headers->get('Content-Type').'; charset='.$charset);
}
// Fix Content-Length
if ($headers->has('Transfer-Encoding')) {
$headers->remove('Content-Length');
}
if ($request->isMethod('HEAD')) {
// cf. RFC2616 14.13
$length = $headers->get('Content-Length');
$this->setContent(null);
if ($length) {
$headers->set('Content-Length', $length);
}
}
}
// Fix protocol
if ('HTTP/1.0' != $request->server->get('SERVER_PROTOCOL')) {
$this->setProtocolVersion('1.1');
}
// Check if we need to send extra expire info headers
if ('1.0' == $this->getProtocolVersion() && str_contains($headers->get('Cache-Control', ''), 'no-cache')) {
$headers->set('pragma', 'no-cache');
$headers->set('expires', -1);
}
$this->ensureIEOverSSLCompatibility($request);
if ($request->isSecure()) {
foreach ($headers->getCookies() as $cookie) {
$cookie->setSecureDefault(true);
}
}
return $this;
}
/**
* Sends HTTP headers.
*
* @return $this
*/
public function sendHeaders(): static
{
// headers have already been sent by the developer
if (headers_sent()) {
return $this;
}
// headers
foreach ($this->headers->allPreserveCaseWithoutCookies() as $name => $values) {
$replace = 0 === strcasecmp($name, 'Content-Type');
foreach ($values as $value) {
header($name.': '.$value, $replace, $this->statusCode);
}
}
// cookies
foreach ($this->headers->getCookies() as $cookie) {
header('Set-Cookie: '.$cookie, false, $this->statusCode);
}
// status
header(sprintf('HTTP/%s %s %s', $this->version, $this->statusCode, $this->statusText), true, $this->statusCode);
return $this;
}
/**
* Sends content for the current web response.
*
* @return $this
*/
public function sendContent(): static
{
echo $this->content;
return $this;
}
/**
* Sends HTTP headers and content.
*
* @return $this
*/
public function send(): static
{
$this->sendHeaders();
$this->sendContent();
if (\function_exists('fastcgi_finish_request')) {
fastcgi_finish_request();
} elseif (\function_exists('litespeed_finish_request')) {
litespeed_finish_request();
} elseif (!\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true)) {
static::closeOutputBuffers(0, true);
flush();
}
return $this;
}
/**
* Sets the response content.
*
* @return $this
*/
public function setContent(?string $content): static
{
$this->content = $content ?? '';
return $this;
}
/**
* Gets the current response content.
*/
public function getContent(): string|false
{
return $this->content;
}
/**
* Sets the HTTP protocol version (1.0 or 1.1).
*
* @return $this
*
* @final
*/
public function setProtocolVersion(string $version): static
{
$this->version = $version;
return $this;
}
/**
* Gets the HTTP protocol version.
*
* @final
*/
public function getProtocolVersion(): string
{
return $this->version;
}
/**
* Sets the response status code.
*
* If the status text is null it will be automatically populated for the known
* status codes and left empty otherwise.
*
* @return $this
*
* @throws \InvalidArgumentException When the HTTP status code is not valid
*
* @final
*/
public function setStatusCode(int $code, string $text = null): static
{
$this->statusCode = $code;
if ($this->isInvalid()) {
throw new \InvalidArgumentException(sprintf('The HTTP status code "%s" is not valid.', $code));
}
if (null === $text) {
$this->statusText = self::$statusTexts[$code] ?? 'unknown status';
return $this;
}
if (false === $text) {
$this->statusText = '';
return $this;
}
$this->statusText = $text;
return $this;
}
/**
* Retrieves the status code for the current web response.
*
* @final
*/
public function getStatusCode(): int
{
return $this->statusCode;
}
/**
* Sets the response charset.
*
* @return $this
*
* @final
*/
public function setCharset(string $charset): static
{
$this->charset = $charset;
return $this;
}
/**
* Retrieves the response charset.
*
* @final
*/
public function getCharset(): ?string
{
return $this->charset;
}
/**
* Returns true if the response may safely be kept in a shared (surrogate) cache.
*
* Responses marked "private" with an explicit Cache-Control directive are
* considered uncacheable.
*
* Responses with neither a freshness lifetime (Expires, max-age) nor cache
* validator (Last-Modified, ETag) are considered uncacheable because there is
* no way to tell when or how to remove them from the cache.
*
* Note that RFC 7231 and RFC 7234 possibly allow for a more permissive implementation,
* for example "status codes that are defined as cacheable by default [...]
* can be reused by a cache with heuristic expiration unless otherwise indicated"
* (https://tools.ietf.org/html/rfc7231#section-6.1)
*
* @final
*/
public function isCacheable(): bool
{
if (!\in_array($this->statusCode, [200, 203, 300, 301, 302, 404, 410])) {
return false;
}
if ($this->headers->hasCacheControlDirective('no-store') || $this->headers->getCacheControlDirective('private')) {
return false;
}
return $this->isValidateable() || $this->isFresh();
}
/**
* Returns true if the response is "fresh".
*
* Fresh responses may be served from cache without any interaction with the
* origin. A response is considered fresh when it includes a Cache-Control/max-age
* indicator or Expires header and the calculated age is less than the freshness lifetime.
*
* @final
*/
public function isFresh(): bool
{
return $this->getTtl() > 0;
}
/**
* Returns true if the response includes headers that can be used to validate
* the response with the origin server using a conditional GET request.
*
* @final
*/
public function isValidateable(): bool
{
return $this->headers->has('Last-Modified') || $this->headers->has('ETag');
}
/**
* Marks the response as "private".
*
* It makes the response ineligible for serving other clients.
*
* @return $this
*
* @final
*/
public function setPrivate(): static
{
$this->headers->removeCacheControlDirective('public');
$this->headers->addCacheControlDirective('private');
return $this;
}
/**
* Marks the response as "public".
*
* It makes the response eligible for serving other clients.
*
* @return $this
*
* @final
*/
public function setPublic(): static
{
$this->headers->addCacheControlDirective('public');
$this->headers->removeCacheControlDirective('private');
return $this;
}
/**
* Marks the response as "immutable".
*
* @return $this
*
* @final
*/
public function setImmutable(bool $immutable = true): static
{
if ($immutable) {
$this->headers->addCacheControlDirective('immutable');
} else {
$this->headers->removeCacheControlDirective('immutable');
}
return $this;
}
/**
* Returns true if the response is marked as "immutable".
*
* @final
*/
public function isImmutable(): bool
{
return $this->headers->hasCacheControlDirective('immutable');
}
/**
* Returns true if the response must be revalidated by shared caches once it has become stale.
*
* This method indicates that the response must not be served stale by a
* cache in any circumstance without first revalidating with the origin.
* When present, the TTL of the response should not be overridden to be
* greater than the value provided by the origin.
*
* @final
*/
public function mustRevalidate(): bool
{
return $this->headers->hasCacheControlDirective('must-revalidate') || $this->headers->hasCacheControlDirective('proxy-revalidate');
}
/**
* Returns the Date header as a DateTime instance.
*
* @throws \RuntimeException When the header is not parseable
*
* @final
*/
public function getDate(): ?\DateTimeInterface
{
return $this->headers->getDate('Date');
}
/**
* Sets the Date header.
*
* @return $this
*
* @final
*/
public function setDate(\DateTimeInterface $date): static
{
if ($date instanceof \DateTime) {
$date = \DateTimeImmutable::createFromMutable($date);
}
$date = $date->setTimezone(new \DateTimeZone('UTC'));
$this->headers->set('Date', $date->format('D, d M Y H:i:s').' GMT');
return $this;
}
/**
* Returns the age of the response in seconds.
*
* @final
*/
public function getAge(): int
{
if (null !== $age = $this->headers->get('Age')) {
return (int) $age;
}
return max(time() - (int) $this->getDate()->format('U'), 0);
}
/**
* Marks the response stale by setting the Age header to be equal to the maximum age of the response.
*
* @return $this
*/
public function expire(): static
{
if ($this->isFresh()) {
$this->headers->set('Age', $this->getMaxAge());
$this->headers->remove('Expires');
}
return $this;
}
/**
* Returns the value of the Expires header as a DateTime instance.
*
* @final
*/
public function getExpires(): ?\DateTimeInterface
{
try {
return $this->headers->getDate('Expires');
} catch (\RuntimeException $e) {
// according to RFC 2616 invalid date formats (e.g. "0" and "-1") must be treated as in the past
return \DateTime::createFromFormat('U', time() - 172800);
}
}
/**
* Sets the Expires HTTP header with a DateTime instance.
*
* Passing null as value will remove the header.
*
* @return $this
*
* @final
*/
public function setExpires(\DateTimeInterface $date = null): static
{
if (null === $date) {
$this->headers->remove('Expires');
return $this;
}
if ($date instanceof \DateTime) {
$date = \DateTimeImmutable::createFromMutable($date);
}
$date = $date->setTimezone(new \DateTimeZone('UTC'));
$this->headers->set('Expires', $date->format('D, d M Y H:i:s').' GMT');
return $this;
}
/**
* Returns the number of seconds after the time specified in the response's Date
* header when the response should no longer be considered fresh.
*
* First, it checks for a s-maxage directive, then a max-age directive, and then it falls
* back on an expires header. It returns null when no maximum age can be established.
*
* @final
*/
public function getMaxAge(): ?int
{
if ($this->headers->hasCacheControlDirective('s-maxage')) {
return (int) $this->headers->getCacheControlDirective('s-maxage');
}
if ($this->headers->hasCacheControlDirective('max-age')) {
return (int) $this->headers->getCacheControlDirective('max-age');
}
if (null !== $this->getExpires()) {
return (int) $this->getExpires()->format('U') - (int) $this->getDate()->format('U');
}
return null;
}
/**
* Sets the number of seconds after which the response should no longer be considered fresh.
*
* This methods sets the Cache-Control max-age directive.
*
* @return $this
*
* @final
*/
public function setMaxAge(int $value): static
{
$this->headers->addCacheControlDirective('max-age', $value);
return $this;
}
/**
* Sets the number of seconds after which the response should no longer be considered fresh by shared caches.
*
* This methods sets the Cache-Control s-maxage directive.
*
* @return $this
*
* @final
*/
public function setSharedMaxAge(int $value): static
{
$this->setPublic();
$this->headers->addCacheControlDirective('s-maxage', $value);
return $this;
}
/**
* Returns the response's time-to-live in seconds.
*
* It returns null when no freshness information is present in the response.
*
* When the responses TTL is <= 0, the response may not be served from cache without first
* revalidating with the origin.
*
* @final
*/
public function getTtl(): ?int
{
$maxAge = $this->getMaxAge();
return null !== $maxAge ? $maxAge - $this->getAge() : null;
}
/**
* Sets the response's time-to-live for shared caches in seconds.
*
* This method adjusts the Cache-Control/s-maxage directive.
*
* @return $this
*
* @final
*/
public function setTtl(int $seconds): static
{
$this->setSharedMaxAge($this->getAge() + $seconds);
return $this;
}
/**
* Sets the response's time-to-live for private/client caches in seconds.
*
* This method adjusts the Cache-Control/max-age directive.
*
* @return $this
*
* @final
*/
public function setClientTtl(int $seconds): static
{
$this->setMaxAge($this->getAge() + $seconds);
return $this;
}
/**
* Returns the Last-Modified HTTP header as a DateTime instance.
*
* @throws \RuntimeException When the HTTP header is not parseable
*
* @final
*/
public function getLastModified(): ?\DateTimeInterface
{
return $this->headers->getDate('Last-Modified');
}
/**
* Sets the Last-Modified HTTP header with a DateTime instance.
*
* Passing null as value will remove the header.
*
* @return $this
*
* @final
*/
public function setLastModified(\DateTimeInterface $date = null): static
{
if (null === $date) {
$this->headers->remove('Last-Modified');
return $this;
}
if ($date instanceof \DateTime) {
$date = \DateTimeImmutable::createFromMutable($date);
}
$date = $date->setTimezone(new \DateTimeZone('UTC'));
$this->headers->set('Last-Modified', $date->format('D, d M Y H:i:s').' GMT');
return $this;
}
/**
* Returns the literal value of the ETag HTTP header.
*
* @final
*/
public function getEtag(): ?string
{
return $this->headers->get('ETag');
}
/**
* Sets the ETag value.
*
* @param string|null $etag The ETag unique identifier or null to remove the header
* @param bool $weak Whether you want a weak ETag or not
*
* @return $this
*
* @final
*/
public function setEtag(string $etag = null, bool $weak = false): static
{
if (null === $etag) {
$this->headers->remove('Etag');
} else {
if (!str_starts_with($etag, '"')) {
$etag = '"'.$etag.'"';
}
$this->headers->set('ETag', (true === $weak ? 'W/' : '').$etag);
}
return $this;
}
/**
* Sets the response's cache headers (validation and/or expiration).
*
* Available options are: must_revalidate, no_cache, no_store, no_transform, public, private, proxy_revalidate, max_age, s_maxage, immutable, last_modified and etag.
*
* @return $this
*
* @throws \InvalidArgumentException
*
* @final
*/
public function setCache(array $options): static
{
if ($diff = array_diff(array_keys($options), array_keys(self::HTTP_RESPONSE_CACHE_CONTROL_DIRECTIVES))) {
throw new \InvalidArgumentException(sprintf('Response does not support the following options: "%s".', implode('", "', $diff)));
}
if (isset($options['etag'])) {
$this->setEtag($options['etag']);
}
if (isset($options['last_modified'])) {
$this->setLastModified($options['last_modified']);
}
if (isset($options['max_age'])) {
$this->setMaxAge($options['max_age']);
}
if (isset($options['s_maxage'])) {
$this->setSharedMaxAge($options['s_maxage']);
}
foreach (self::HTTP_RESPONSE_CACHE_CONTROL_DIRECTIVES as $directive => $hasValue) {
if (!$hasValue && isset($options[$directive])) {
if ($options[$directive]) {
$this->headers->addCacheControlDirective(str_replace('_', '-', $directive));
} else {
$this->headers->removeCacheControlDirective(str_replace('_', '-', $directive));
}
}
}
if (isset($options['public'])) {
if ($options['public']) {
$this->setPublic();
} else {
$this->setPrivate();
}
}
if (isset($options['private'])) {
if ($options['private']) {
$this->setPrivate();
} else {
$this->setPublic();
}
}
return $this;
}
/**
* Modifies the response so that it conforms to the rules defined for a 304 status code.
*
* This sets the status, removes the body, and discards any headers
* that MUST NOT be included in 304 responses.
*
* @return $this
*
* @see https://tools.ietf.org/html/rfc2616#section-10.3.5
*
* @final
*/
public function setNotModified(): static
{
$this->setStatusCode(304);
$this->setContent(null);
// remove headers that MUST NOT be included with 304 Not Modified responses
foreach (['Allow', 'Content-Encoding', 'Content-Language', 'Content-Length', 'Content-MD5', 'Content-Type', 'Last-Modified'] as $header) {
$this->headers->remove($header);
}
return $this;
}
/**
* Returns true if the response includes a Vary header.
*
* @final
*/
public function hasVary(): bool
{
return null !== $this->headers->get('Vary');
}
/**
* Returns an array of header names given in the Vary header.
*
* @final
*/
public function getVary(): array
{
if (!$vary = $this->headers->all('Vary')) {
return [];
}
$ret = [];
foreach ($vary as $item) {
$ret[] = preg_split('/[\s,]+/', $item);
}
return array_merge([], ...$ret);
}
/**
* Sets the Vary header.
*
* @param bool $replace Whether to replace the actual value or not (true by default)
*
* @return $this
*
* @final
*/
public function setVary(string|array $headers, bool $replace = true): static
{
$this->headers->set('Vary', $headers, $replace);
return $this;
}
/**
* Determines if the Response validators (ETag, Last-Modified) match
* a conditional value specified in the Request.
*
* If the Response is not modified, it sets the status code to 304 and
* removes the actual content by calling the setNotModified() method.
*
* @final
*/
public function isNotModified(Request $request): bool
{
if (!$request->isMethodCacheable()) {
return false;
}
$notModified = false;
$lastModified = $this->headers->get('Last-Modified');
$modifiedSince = $request->headers->get('If-Modified-Since');
if (($ifNoneMatchEtags = $request->getETags()) && (null !== $etag = $this->getEtag())) {
if (0 == strncmp($etag, 'W/', 2)) {
$etag = substr($etag, 2);
}
// Use weak comparison as per https://tools.ietf.org/html/rfc7232#section-3.2.
foreach ($ifNoneMatchEtags as $ifNoneMatchEtag) {
if (0 == strncmp($ifNoneMatchEtag, 'W/', 2)) {
$ifNoneMatchEtag = substr($ifNoneMatchEtag, 2);
}
if ($ifNoneMatchEtag === $etag || '*' === $ifNoneMatchEtag) {
$notModified = true;
break;
}
}
}
// Only do If-Modified-Since date comparison when If-None-Match is not present as per https://tools.ietf.org/html/rfc7232#section-3.3.
elseif ($modifiedSince && $lastModified) {
$notModified = strtotime($modifiedSince) >= strtotime($lastModified);
}
if ($notModified) {
$this->setNotModified();
}
return $notModified;
}
/**
* Is response invalid?
*
* @see https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html
*
* @final
*/
public function isInvalid(): bool
{
return $this->statusCode < 100 || $this->statusCode >= 600;
}
/**
* Is response informative?
*
* @final
*/
public function isInformational(): bool
{
return $this->statusCode >= 100 && $this->statusCode < 200;
}
/**
* Is response successful?
*
* @final
*/
public function isSuccessful(): bool
{
return $this->statusCode >= 200 && $this->statusCode < 300;
}
/**
* Is the response a redirect?
*
* @final
*/
public function isRedirection(): bool
{
return $this->statusCode >= 300 && $this->statusCode < 400;
}
/**
* Is there a client error?
*
* @final
*/
public function isClientError(): bool
{
return $this->statusCode >= 400 && $this->statusCode < 500;
}
/**
* Was there a server side error?
*
* @final
*/
public function isServerError(): bool
{
return $this->statusCode >= 500 && $this->statusCode < 600;
}
/**
* Is the response OK?
*
* @final
*/
public function isOk(): bool
{
return 200 === $this->statusCode;
}
/**
* Is the response forbidden?
*
* @final
*/
public function isForbidden(): bool
{
return 403 === $this->statusCode;
}
/**
* Is the response a not found error?
*
* @final
*/
public function isNotFound(): bool
{
return 404 === $this->statusCode;
}
/**
* Is the response a redirect of some form?
*
* @final
*/
public function isRedirect(string $location = null): bool
{
return \in_array($this->statusCode, [201, 301, 302, 303, 307, 308]) && (null === $location ?: $location == $this->headers->get('Location'));
}
/**
* Is the response empty?
*
* @final
*/
public function isEmpty(): bool
{
return \in_array($this->statusCode, [204, 304]);
}
/**
* Cleans or flushes output buffers up to target level.
*
* Resulting level can be greater than target level if a non-removable buffer has been encountered.
*
* @final
*/
public static function closeOutputBuffers(int $targetLevel, bool $flush): void
{
$status = ob_get_status(true);
$level = \count($status);
$flags = \PHP_OUTPUT_HANDLER_REMOVABLE | ($flush ? \PHP_OUTPUT_HANDLER_FLUSHABLE : \PHP_OUTPUT_HANDLER_CLEANABLE);
while ($level-- > $targetLevel && ($s = $status[$level]) && (!isset($s['del']) ? !isset($s['flags']) || ($s['flags'] & $flags) === $flags : $s['del'])) {
if ($flush) {
ob_end_flush();
} else {
ob_end_clean();
}
}
}
/**
* Marks a response as safe according to RFC8674.
*
* @see https://tools.ietf.org/html/rfc8674
*/
public function setContentSafe(bool $safe = true): void
{
if ($safe) {
$this->headers->set('Preference-Applied', 'safe');
} elseif ('safe' === $this->headers->get('Preference-Applied')) {
$this->headers->remove('Preference-Applied');
}
$this->setVary('Prefer', false);
}
/**
* Checks if we need to remove Cache-Control for SSL encrypted downloads when using IE < 9.
*
* @see http://support.microsoft.com/kb/323308
*
* @final
*/
protected function ensureIEOverSSLCompatibility(Request $request): void
{
if (false !== stripos($this->headers->get('Content-Disposition') ?? '', 'attachment') && 1 == preg_match('/MSIE (.*?);/i', $request->server->get('HTTP_USER_AGENT') ?? '', $match) && true === $request->isSecure()) {
if ((int) preg_replace('/(MSIE )(.*?);/', '$2', $match[0]) < 9) {
$this->headers->remove('Cache-Control');
}
}
}
}
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