Can't rescue 415 Unsupported Media type error

Hi.

I have an issue with the grape that I cannot rescue 415 Unsupported Media type error. It does not appear in any rescue_from handlers, the reason for this is that this error is handled by grape with throw/ catch statements and logic for those different from raise/rescue.

I made a patch which catch thrown errors and than raises those thought grape base exception, like this:

module GrapeErrorPatch
  def call!(env)
    @env = env

    begin
      thrown_error = catch(:error) { return @app.call(@env) }

      raise Grape::Exceptions::Base.new(status: thrown_error[:status],
                                        message: thrown_error[:message])
    rescue Exception => error # rubocop:disable Lint/RescueException
      handler = select_error_handler(error)

      run_rescue_handler(handler, error)
    end
  end

  def select_error_handler(error)
    rescue_handler_for_base_only_class(error.class) ||
      rescue_handler_for_class_or_its_ancestor(error.class) ||
      rescue_handler_for_grape_exception(error.class) ||
      rescue_handler_for_any_class(error.class) ||
      raise
  end
end

::Grape::Middleware::Error.class_eval { prepend(GrapeErrorPatch) }

Could you please advice a better way to handle that? What is the grape way to handle thrown errors?

Start with Grape::Middleware::Error and the rescue_from handling path, then reproduce how a 415 Unsupported Media Type response is thrown. Determine the supported Grape mechanism for handling that error and verify that the resulting behavior is consistent with rescue_from expectations.