instance method POST

# File actionpack/lib/action_dispatch/http/request.rb, line 408
    def POST
      fetch_header("action_dispatch.request.request_parameters") do
        encoding_template = Request::Utils::CustomParamEncoder.action_encoding_template(self, path_parameters[:controller], path_parameters[:action])

        param_list = nil
        pr = parse_formatted_parameters(params_parsers) do
          if param_list = request_parameters_list
            ActionDispatch::ParamBuilder.from_pairs(param_list, encoding_template: encoding_template)
          else
            # We're not using a version of Rack that provides raw form
            # pairs; we must use its hash (and thus post-process it below).
            fallback_request_parameters
          end
        end

        # If the request body was parsed by a custom parser like JSON
        # (and thus the above block was not run), we need to
        # post-process the result hash.
        if param_list.nil?
          pr = ActionDispatch::ParamBuilder.from_hash(pr, encoding_template: encoding_template)
        end

        self.request_parameters = pr
      end
    rescue ActionDispatch::ParamError, EOFError => e
      raise ActionController::BadRequest.new("Invalid request parameters: #{e.message}")
    end