How are "304 Not Modified" responses generated? How does a browser determine whether the response to an HTTP request is 304? Is it set by the browser or sent from the server? If sent. 59 Any ideas why on some links that I try to access using HttpWebRequest I am getting "The remote server returned an error: (304) Not Modified." in the code? The code I'm using is from. May 14, 2014Β Β· 10 I am currently trying to understand how exactly 304/Not modified qualifies for the 3xx-range class of HTTP status codes. RFC 1945, sec. 9.3 and RFC 2616, sec. 10.3 both.

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