bool hasSession() Whether the request contains a Session object. This method does not

setExpression(ExpressionLanguage

string|null guessExtension() Returns the extension based on the mime type. If the mime

array keys() Returns a list of all defined types.

setAll(array $messages) Sets all flash messages.

bool isInvalid() Is response invalid?

matchHost(string $regexp) Adds a check for the URL host name.

string getClientIp() Returns the client IP address. This method can read the client IP

close() {@inheritdoc}

bool has(string $key) Returns true if the HTTP header is defined.