class Faraday::Connection

def in_parallel(manager = nil)

Returns nothing.
Yields a block to execute multiple requests.

manager - The parallel manager that this Connection's Adapter uses.

Public: Sets up the parallel manager to make a set of requests. 
def in_parallel(manager = nil)
  @parallel_manager = manager || default_parallel_manager {
    warn "Warning: `in_parallel` called but no parallel-capable adapter on Faraday stack"
    warn caller[2,10].join("\n")
    nil
  }
  yield
  @parallel_manager && @parallel_manager.run
ensure
  @parallel_manager = nil
end