I sometimes get the same ones at work! It's the crawler from the Baidu-search-engine checking if the printer is a web-server.
I contacted ITS about it (obviously, you shouldn't be able to print from outside the university) but they haven't really given it any work. It surely is a security hole, and a minor waste of ink & paper.
Actually, it's somebody searching for an open proxy, note the inclusion of http and hostname in the GET. The baidu crawler wouldn't be so ridiculous as to request its own homepage from your server. Somebody is testing to see if they can get your server to proxy to baidu for them.
I contacted ITS about it (obviously, you shouldn't be able to print from outside the university) but they haven't really given it any work. It surely is a security hole, and a minor waste of ink & paper.