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I have seen multiple empty http request log entries from Apache:

HOST:443 REMOTEIP - - [DATA AND TIME] "-" SIZE SIZE "-" "-"

Are these malicious attacks, or some misconfiguration on my side?

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That first SIZE is actually the return code, isn't it one of 400 or 404? –  ott-- May 6 '13 at 14:08
    
The IP is not corresponding to the loopback or the IP of the server ? –  Dom May 6 '13 at 14:50

1 Answer 1

Empty responses are perfectly normal if e.g. the HTTP return code is 304 (Not modified). The client sending the request is sending headers like If-Modified-Since or If-None-Matches and the server uses them to determine that nothing changed and sends an empty response, allowing the client to use its cached copy.

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