Function: parseRetryAfterMs()
parseRetryAfterMs(
header,nowMs):number|undefined
Delay (ms) a 429 response asks us to wait, from its Retry-After header,
or undefined when absent/unparseable. Handles both header forms: an integer
count of seconds, and an HTTP date to wait until (clamped to >= 0).
Parameters
Section titled “Parameters”header
Section titled “header”string | null
number
Returns
Section titled “Returns”number | undefined