[Httpd Wiki] Update of "ProxyAbuse" by TimBannister

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The "ProxyAbuse" page has been changed by TimBannister:
http://wiki.apache.org/httpd/ProxyAbuse?action=diff&rev1=8&rev2=9

Comment:
Don't alarm people seeing 200 status in response to proxy attempts

  63.251.56.142 - - [25/Jul/2002:12:48:04 -0700] "GET http://www.yahoo.com/ HTTP/1.0" 200 1456 
  }}}
  
- For this log line, the ''200'' code (second to last field in this example) indicates that the proxy request was successful.
+ For this log line, the ''200'' code (second to last field in this example) indicates that the request was successful – but see below for an explanation of what “success” means in this situation.
  
  This is usually the result of malicious clients trying to exploit open proxy servers to access a website without revealing their true location. They could be doing this to manipulate pay-per-click ad systems, to add comment or link-spam to someone else's site, or just to do something nasty without being detected.
  

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