Changes in project api?

Hi,

have there recently been changes in the api? My http request does not work anymore at the point were I insert new milestones. It worked before however and I can't figure out why and what I need to change at my code. If I use the html forms it works.

Thank you for any suggestions.
Olaf
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HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setRequestMethod( "POST" );
            connection.setDoInput( true );
            connection.setDoOutput( true );
               connection.setUseCaches( false );


               OutputStreamWriter writer = new OutputStreamWriter( connection.getOutputStream() );
            writer.write(parameter);
            writer.flush();
            writer.close();
            System.out.println("in http nach connectionPOST");

            BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));


            for ( String line; (line = reader.readLine()) != null; )
            {
                ergebnisAbfrage = ergebnisAbfrage + line ;

            }

            reader.close();
            connection.disconnect();