The method 11, wherein a connection is opened if {HEAD ~ the server response time} is slower than {TAIL ~ the predetermined range} of times 
is slower than
The method 11 , wherein a connection is opened if { HEAD ~ the server response time } is slower than { TAIL ~ the predetermined range } of times
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH