Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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


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

share|improve this question
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

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.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.