strange httpd

[Julian Fondren]

I have this in my httpd access logs:

58.218.149.30 - - [27/Apr/2006:07:49:12 -0500] "GET http://www.qq.com/
HTTP/1.1" 200 [54,52,56]
220.134.13.167 - - [28/Apr/2006:06:05:05 -0500] "GET
http://www.ebay.com/ HTTP/1.1" 200 [54,52,56]
217.160.249.106 - - [29/Apr/2006:07:41:29 -0500] "GET
http://66.29.102.2/~antigoth/printenv.php HTTP/1.1" 404 0
219.132.23.120 - - [29/Apr/2006:09:17:22 -0500] "GET
http://verify.qq.com/getimage?0.5770163684465186 HTTP/1.1" 404 0

... in which it seems that someone is randomly trying to use my server
as a proxy.  I wouldn't be disturbed, except that the first two
requests seem to have /succeeded/ -- and neither I nor the httpd
documentation know what [54,52,56] mean as 'lengths'.

Can someone explain what happened?

Thanks.