class Faraday::Middleware

def default_options=(options = {})

Other tags:
    Example: Set the Faraday::Response::RaiseError option, `include_request` to `false` - 
def default_options=(options = {})
  validate_default_options(options)
  LOCK.synchronize do
    @default_options = default_options.merge(options)
  end
end