Consideration on duplication parameters.

  There were things I didn't understand before. I thought I would get id = user from server if I request by http://localhost:111/test.do?id=user&id=user. But it was different from case to case and the way to receive parameters is the gate which was many. get / post, or a specific parameter name, all parameters in an array or structure. This depends on how the server handles it, so full consideration is required.