The second HTTP status code returned was 304 Not Modified, because the page had not changed its data since the initial GET request. This packet is about 1/3 of the size of the first 200 OK message, because there is no actual content being returned, just an indication that nothing has changed and to load what is currently in the cache. This allows for less data needed to be transferred between the client and the server, because the data the client needs is already on the local machine.