wdisp/HTTPS/sticky_mask is a SAP Parameter attribute which is used to control HTTPS ROUTER protocol: bit mask for stickiness of client IP adresses information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Caution
This parameter is only required for HTTPS connections. The parameter has
no meaning for HTTP connections.
This parameter describes a bit mask for client IP addresses. The IP
address of a client that connects to the Web Dispatcher is linked to
this bit mask (AND link), and the result is used for the load balancing
of clients.
This allows you to combine groups of client IP addresses. This
functionality is required because large internet providers use several
proxies (with different IP addresses) but the clients must be handled in
the same way (for applications with a state in the server).
See SAP Parameter Documentation for full SAP documentation for this profile parameter.