function Response::isCacheable

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

File

vendor/symfony/http-foundation/Response.php, line 538

Class

Response

Response represents an HTTP response.

Namespace

Symfony\Component\HttpFoundation

Code

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();
}