int|null getTtl() 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. Return Value int|null The TTL in seconds

int|null getMaxAge() 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. Return Value int|null Number of seconds

string getProtocolVersion() Gets the HTTP protocol version. Return Value string The HTTP protocol version

DateTime|null getExpires() Returns the value of the Expires header as a DateTime instance. Return Value DateTime|null A DateTime instance or null if the header does not exist

string|array getHeader(string $header, bool $first = true) Gets a response header. Parameters string $header The header name bool $first Whether to return the first value or all header values Return Value string|array The first header value if $first is true, an array of values otherwise

string|null getEtag() Returns the literal value of the ETag HTTP header. Return Value string|null The ETag HTTP header or null if it does not exist

array getHeaders() Gets the response headers. Return Value array The response headers

DateTime|null getLastModified() Returns the Last-Modified HTTP header as a DateTime instance. Return Value DateTime|null A DateTime instance or null if the header does not exist Exceptions RuntimeException When the HTTP header is not parseable

string getContent() Gets the current response content. Return Value string Content

string getCharset() Retrieves the response charset. Return Value string Character set