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Looking at our Apache log I see normal requests like: 

174.133.xxx.xxx - - [20/May/2010:17:36:44 -0700] "GET /index.html HTTP/1.1" 200 2004

but every so often i get a cluster of these w/out an IP address. 

::1 - - [20/May/2010:18:47:21 -0700] "OPTIONS * HTTP/1.0" 200 -
::1 - - [20/May/2010:18:47:22 -0700] "OPTIONS * HTTP/1.0" 200 -
::1 - - [20/May/2010:18:47:23 -0700] "OPTIONS * HTTP/1.0" 200 -

what do they mean and curious what causes them?

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2 Answers

up vote 3 down vote accepted

These are normal. ::1 is the IPv6 address for localhost; the OPTIONS requests are part of how Apache manages its child threads.

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up vote 1 down vote

That's IPv6 localhost - something on your server is making requests to "localhost" and it's resolving to ::1.

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