This entry got logged in a Apache access log:
IP ADDRESS - - [00/00/0000:00:00:00 -0000] " " 301 - "-" "-"
It was detected by LogWatch as a null HTTP Response and also got marked as a successful probe..
I am curious about how this request about made and how it is considered a successful probe. Here is what I can decipher with specific questions:
- Their request was " " - what does this mean?
- HTTP return code was 301: this website has a redirect defined in the Apache config - perhaps they were hitting the URL which triggers this redirect?
- They were not using a proper HTTP request
- They got "-" size return back - what does this mean?