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169. What is the response body of HTTP status code 304?

The response body of HTTP status code 304 (Not Modified) is empty. This is because the 304 status code is used in response to conditional requests with the If-Modified-Since or If-None-Match header, which the server checks to see if the requested resource has been modified since the client last requested it. If the resource has not been modified, the server sends a 304 response, indicating that the client's cached copy is still valid, and there is no need to send the resource again. Therefore, the response body is not included in the 304 response.