int|null getTtl() Returns the response's time-to-live in seconds. It returns null when

bool isValidateable() Returns true if the response includes headers that can be used to validate

static array getMimeTypes(string $format) Gets the mime types associated with the

static closeOutputBuffers(int $targetLevel, bool $flush) Cleans or flushes output

static string getTrustedHeaderName(string $key) Gets the trusted proxy header name

string getMimeType(string $format) Gets the mime type associated with the format.

string getLocale() Get the locale. Return

Response expire()

int count() Returns the number of parameters.

bool hasCacheControlDirective(string $key) Returns true if the Cache-Control directive is defined