How should an HTTP servlet respond to a request with an If-Modified-Since header older than the content's last modification date?
- Return a 200 OK response with the updated content
- Return a 304 Not Modified response
- Return a 403 Forbidden response
- Return a 500 Internal Server Error response
If the If-Modified-Since header indicates that the content hasn't been modified since the provided date, the servlet should return a 304 Not Modified response to indicate that the client's cached copy is still valid.
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