Parses a Retry-After value into milliseconds. RFC 9110 permits two forms:
Retry-After
120
Wed, 21 Oct 2015 07:28:00 GMT
the raw header value
clock reading used to convert an HTTP-date into a delay; injectable for tests
milliseconds to wait, or undefined when the value is unusable
Parses a
Retry-Aftervalue into milliseconds. RFC 9110 permits two forms:120Wed, 21 Oct 2015 07:28:00 GMT