wdisp/group_info_protocol is a SAP Parameter attribute which is used to control Protocol used for logon group information retrieval 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 .
Log that uses the SAP Web Dispatcher uses to read logon group
information from the application server.
You can secure the conenction using HTTPS.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.