Example: CGI-style Request Procedures
ns_register_proc binds procs to arbitrary requests:
ns_register_proc GET /demo/time getTime
set headers [ns_conn headers]
set browser [ns_set iget $headers User-Agent]
set page “<html><body>\n”
append page “Time: [clock seconds]<br>\n”
append page “Browser: $browser\n”
append page “</body></html>”
ns_return 200 text/html $page