ns_sockopen - Connect to a remote host on the specified port
ns_sockopen uses socket(), bind(), and connect() calls to connect to the remote host (host) on the specified port (port). ns_sockopen returns a list of two file ids: the first one for reads and the second one for writes.
The -nonblock option specifies that the command will return immediately, while the connect is still in progress by the operating system. If you use -nonblock, you then can call ns_sockcheck with the write file id to see if the connect was actually completed.
The -timeout t option specifies how long to wait for the connect to be made. The value t can be specified in the form secs?:microsecs?, or secs.fraction, or as a number with a time unit.
set fds [ns_sockopen www.aolserver.com 80]
set rid [lindex $fds 0]
set wid [lindex $fds 1]
puts $wid "GET /index.htm HTTP/1.0\r\n\r"
flush $wid
while {[set line [string trim [gets $rid]]] != ""} {
lappend headers $line
}
set page [read $rid]
close $rid
close $wid