class ActionDispatch::Request

def POST
  fetch_header("action_dispatch.request.request_parameters") do
    pr = parse_formatted_parameters(params_parsers) do |params|
      super || {}
    end
    pr = Request::Utils.set_binary_encoding(self, pr, path_parameters[:controller], path_parameters[:action])
    Request::Utils.check_param_encoding(pr)
    self.request_parameters = Request::Utils.normalize_encode_params(pr)
  end
rescue Rack::Utils::ParameterTypeError, Rack::Utils::InvalidParameterError, Rack::QueryParser::ParamsTooDeepError, EOFError => e
  raise ActionController::BadRequest.new("Invalid request parameters: #{e.message}")
end