ms/redirect_version is a SAP Parameter attribute which is used to control status code for redirect requests 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 .
Defines the status code that is returned to the HTTP client as a
redirect response.
0 : 301 (MOVED PERMANENTLY) for all requests
1 : 302 (MOVED TEMPORARILY) for HTTP/1.0 307 (TEMPORARY REDIRECT) for
HTTP/1.1
See SAP Parameter Documentation for full SAP documentation for this profile parameter.