based on core cookbokk, it is not clear to me what happens when drop is
executed in branch route:

  drop
  Stop the execution of the configuration script and alter the implicit
  action which is done afterwards. 
  If the function is called in a 'branch_route' then the branch is
  discarded (implicit action for 'branch_route' is to forward the
  request).

i understand that request is not forwarded to that branch, but if that
branch is the only branch, does t_relay() then return -1 or is script
execution terminated?

-- juha

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