one PC send continuos and fast traffic to webproxy see log

hi what you think about this

192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupported-request-
method - NONE/- text/html
17:42:52 web-proxy,debug,packet 1143049372.446 1 192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupported-request-
method - NONE/- text/html
17:42:52 web-proxy,debug,packet 1143049372.460 3 192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupported-request-
method - NONE/- text/html
17:42:52 web-proxy,debug,packet 1143049372.466 1 192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupported-request-
method - NONE/- text/html
17:42:52 web-proxy,debug,packet 1143049372.473 0 192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupported-request-
method - NONE/- text/html
17:42:52 web-proxy,debug,packet 1143049372.480 0 192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupported-request-
method - NONE/- text/html
17:42:52 web-proxy,debug,packet 1143049372.505 1 192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupported-request-
method - NONE/- text/html
17:42:52 web-proxy,debug,packet 1143049372.531 1 192.168.1.107 TCP_DENIED/400 1511 NONE error:unsupp


??? is very fast and continuos.

Best Regards