docs: public static String copyToString(InputStream in, Charset charset) throws IOException {
  		Assert.notNull(in, "No InputStream specified");
  		StringBuilder out = new StringBuilder();
  		InputStreamReader reader = new InputStreamReader(in, charset);
  		char[] buffer = new char[BUFFER_SIZE];
  		int bytesRead = -1;
  		while ((bytesRead = reader.read(buffer)) != -1) {
  			out.append(buffer, 0, bytesRead);
  		}
  		return out.toString();
  	}