icm/HTTP/client/keep_alive_timeout is a SAP Parameter attribute which is used to control Keep alive timeout for inactive client connections 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 relates to the "keep-alive feature" of HTTP 1.1. That is,
if a new HTTP request work process is received from the work process
within this period of time, the ICM attempts to reuse an existing
connection. If, for an existing connection, there is no further
communication within the specified time period, the ICM terminates the
connection. This avoids having to keep establishing and terminating
costly network connections.
After the timeout interval has expired, the user context in the work
process is not closed. The user context is closed after the time
interval specified in the profile parameter
See SAP Parameter Documentation for full SAP documentation for this profile parameter.