Redmine

Hello everybody, my name is Kelvin, and living in Brazil. I am delphi developer and am facing major problems with the procedure addissue, last in the example with Delphi REST API. The moment you try to do http.post, it returns me error Bad Request. Only that. I've tried hundreds of different ways. My code is exactly the same as the example, except in the API KEY and other peculiarities. In some cases the return is internal error. I've tried using BitNami 3.2 but not with success. In the get method, it works normally. I apologize for my bad English, I am using Google translator.
Thank you in advance.