You can avoid assigning a new peer to the session in case the peer used in the session went offline. When using this option parameter, you will get a 502 error code for your request when that peer used for your session went offline, with error message:
Error Message
502 Proxy Error: server_error Failed to establish connection with peer
This workflow can be useful for Residential and Mobile proxy zones, which consist of real PCs and mobile devices It’s used by adding -const after your session name, for example -session-mystring12345-const
Shell
curl "http://target.site" --proxy brd.superproxy.io:33335 --proxy-user brd-customer-<customer_id>-zone-<zone_name>-session-mystring12345-const:<zone_password>