shutdown request for server
ignore more requests after server shutdown received
ignore requests after shutdown
send Connection: close header
check ids valid
check that the ids are valid
onyl reject copy when server is going down
allow status, detailed requests
use LWP::UserAgent, JSON in perl client
graceful shutdown request
only disallow new copy requests (keep server active)
use self.stop() to stop server
graceful shutdown waits for all pending items to complete
wait for not done items, then call self.stop
default true for acceptCommands
version bump