wdisp/auto_refresh is a SAP Parameter attribute which is used to control Time between configuration requests to backend (sec.) 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 .
This parameter specifies the time interval after which the route
information of the SAP Web Dispatcher is periodically updated. SAP Web
Dispatcher holds this information in the server table, the group table,
and the URL mapping table. After this period expires, the SAP Web
Dispatcher connects to the message server and an application server to
obtain this information.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.