HTTP If-Modified-Since with milliseconds -


let's object rest web service , object has time stamp. time stamp has milliseconds component. next time request same object don't want returned unless has changed, use if-modified-since header. date in header not supposed have milliseconds. if round time stamp down, i'll object if it's modified. if round risk missing updates. if-modified-since header useless me in case, or missing something?

a service sends time stamp milliseconds not http-compliant. last-modified must sent http-date §3.3.1 specifies clearly:

http-date    = rfc1123-date | rfc850-date | asctime-date rfc1123-date = wkday "," sp date1 sp time sp "gmt" rfc850-date  = weekday "," sp date2 sp time sp "gmt" asctime-date = wkday sp date3 sp time sp 4digit date1        = 2digit sp month sp 4digit               ; day month year (e.g., 02 jun 1982) date2        = 2digit "-" month "-" 2digit               ; day-month-year (e.g., 02-jun-82) date3        = month sp ( 2digit | ( sp 1digit ))               ; month day (e.g., jun  2) time         = 2digit ":" 2digit ":" 2digit               ; 00:00:00 - 23:59:59 wkday        = "mon" | "tue" | "wed"             | "thu" | "fri" | "sat" | "sun" weekday      = "monday" | "tuesday" | "wednesday"             | "thursday" | "friday" | "saturday" | "sunday" month        = "jan" | "feb" | "mar" | "apr"             | "may" | "jun" | "jul" | "aug"             | "sep" | "oct" | "nov" | "dec"

file bug service using. invalid send last-modified or if-modified-since milliseconds.

if sub-second accuracy important, may more appropriate use entity tags (etag).


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