class Faraday::Connection

def default_parallel_manager

Returns a parallel manager or nil if not found.

Yields in case of not found.

parallel-capable adapter.
Internal: Traverse the middleware stack in search of a 
def default_parallel_manager
  @default_parallel_manager ||= begin
    handler = @builder.handlers.detect do |h|
      h.klass.respond_to?(:supports_parallel?) and h.klass.supports_parallel?
    end
    if handler
      handler.klass.setup_parallel_manager
    elsif block_given?
      yield
    end
  end
end