post https报错:HTTP/1.1 400 Bad Request
Params:=TStringList.Create;
Params.Values['SignatureMethod']:=AnsitoUtf8('HmacSHA25');
Params.Values['SignatureVersion']:=AnsitoUtf8('2');
Params.Values['Timestamp']:=AnsitoUtf8('2013-02-27T14%3A00%3A12Z');
Params.Values['Version']:=AnsitoUtf8('2009-01-01');
strxml:=IdHTTP1.post('https://mws.amazonservices.com.cn/',params);
这个post,为什么怎么做,都出这样的结果:HTTP/1.1 400 Bad Request