use crate;
/// ### Retry-After
/// Related: Content handling
///
/// The Retry-After response-header field can be used with a 503 (service
/// unavailable) response to indicate how long the service is expected to be
/// unavailable to the requesting client. The value of this field can be either
/// an HTTP-date or an integer number of seconds (in decimal) after the time of
/// the response.
///
/// Reference: https://www.rfc-editor.org/rfc/rfc1945.html#appendix-D.2.8
///