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304 - Not Modified
Keywords: 304 - Not Modified
If the client has performed a conditional GET request and access is allowed; however, the document has not been modified since the date and time specified in the If-Modified-Since field - then the server responds with this status code and does not send an Entity-Body to the client. If it also says, "Use local copy."
If the client has performed a conditional GET request and access is allowed; however, the document has not been modified since the date and time specified in the If-Modified-Since field - then the server responds with this status code and does not send an Entity-Body to the client. If it also says, "Use local copy." This means that the copy of the file on the web server is not more recent than the copy which your web browser or proxy server has cached locally, so there's no point in sending the file again. This is not an error. I'm not going to send it again.
Other 300's - Redirected requests are those with other codes in the 300s. The most common cause of these requests is that the user has incorrectly requested a directory name without the trailing slash. The server replies with a redirection ("you probably mean the following") and the user then makes a second connection to get the correct document (although usually the browser does it automatically without the user's intervention or knowledge).
If you have a large number of 300 level result codes in your logs, you have probably specified links without the trailing "/" (slash).
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