public static Body empty() {
      return new Body();
    }
Creates a new Request Body with charset encoded data.

@param data to be encoded.
@param charset to encode the data with. if {@literal null}, then data will be considered
    binary and will not be encoded.
@return a new Request.Body instance with the encoded data.
@deprecated please use {@link Request.Body#create(byte[], Charset)}
core/src/main/java/feign/Request.java