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What does '0U' mean in apache's error-log?

Recently, in my apache's error-log, I found a lot of lines like this :

[Mon Sep 12 12:34:56 2011] [error] [client ***.***.***.***] 0U, referer: http://www.***.com/ 

"www.***.com" is my domain name. What does '0U' mean? Responses' code corresponding to the some of the error requests are 416. 开发者_如何转开发My apache's version is 2.2.14. Can someone tell me? Thanks a lot.

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