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telnet$B$H$+<+:n$N%5!<%P$J$I$rAH$_9g$o$;$F!"(B
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  localhost:5678 -> www.host.com:80
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  Host: www.host.com:80

  www.host.com:80 -> localhost:5678
  HTTP/1.0 200 OK
  .....

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---
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<URL:http://www.cs.gunma-u.ac.jp/~j5306050/net/>
