Suppose an HTTP GET request has the following info GET/kurose_ross_sandbox/interactive/quotation5.htm HTTP/1.1 Host: gaia.cs.umass.edu Accept: text/plain, text/html, image/jpeg, image/gif, audio/mpeg, audio/mp4, video/mpeg, video/mp4, Accept-Language: en-us, en-gb;q=0.9, en;q=0.6, fr, fr-ch, zh, da, cs If-Modified-Since: Sun, 20 Sep 2020 03:17:28-0700 User Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0) What would be the server's HTTP response status if the file is not up to date? You may use the format . For example: 505 HTTP Version Not Supported.

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