某日查看日志（服务器有些异常，所以检查一下，发现很多这样的日志：
"CONNECT www.acunetix.wvs:443 HTTP/1.1" 200 84611
"OPTIONS / HTTP/1.1" 200 84611
"TRACK /tTZHHgUA0v HTTP/1.1" 501 316
"TRACE /tTZHHgUA0v HTTP/1.1" 403 311
"PUT /jsky_test.txt HTTP/1.1" 404 310
"TRACE /TRACE_test HTTP/1.1" 403 311
"DELETE /Jsky_test_no_exists_file.txt HTTP/1.1" 404 325
"PUT /jsky_web_scanner_test_file.txt HTTP/1.1" 404 327
"TRACK /TRACK_test HTTP/1.1" 501 316
"OPTIONS / HTTP/1.1" 200 84611
"HEAD /data/dvbbs8.mdb HTTP/1.1" 404 -
"PUT /english/jsky_web_scanner_test_file.txt HTTP/1.1" 404 335
总结了一下，除了常见的GET和POST之外，出现了如下类型的访问：
CONNECT
DELETE
HEAD
OPTIONS
PUT
TRACE
TRACK
没查到这些访问类型的意义，哪位能给指点下么？
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