Sometimes you may want to run multiple sessions on a sticky port. To do this, you would add ";session={session name}" after your username when you authenticate. The session name can be whatever you like, it is simply a name that will help you differentiate between your different sessions.
Examples
Unmetered Residential:
Please note: Unmetered Residential proxies are no longer available for purchase. Existing subscriptions will continue to work, however.
curl -x unmetered.residential.proxyrack.net:10000 -U 'username;session=session1:password' http://example.com
Live example here.
Premium Residential:
curl -x premium.residential.proxyrack.net:10000 -U 'username;session=premiumSession:password' http://example.com
Live example here.
Private Unmetered Residential:
curl -x private.residential.proxyrack.net:10000 -U 'username;session=session3:password' http://example.com
Live example here.
USA Rotating Datacenter:
curl -x usa.rotating.proxyrack.net:10000 -U 'username;session=usaSession:password' http://example.com
Live example here.
Global Rotating Datacenter:
curl -x global.rotating.proxyrack.net:10000 -U 'username;session=session5:password' http://example.com
Live example here.