code: private String readResponse(HttpURLConnection connection) throws IOException {
          if (connection.getResponseCode() == HttpURLConnection.HTTP_NOT_FOUND)
              throw new SdkClientException("The requested metadata is not found at " + connection.getURL());
  
          InputStream inputStream = connection.getInputStream();
  
          try {
              StringBuilder buffer = new StringBuilder();
              while (true) {
                  int c = inputStream.read();
                  if (c == -1) break;
                  buffer.append((char)c);
              }
  
              return buffer.toString();
          } finally {
              inputStream.close();
          }
      }
docs: Reads a response from the Amazon EC2 Instance Metadata Service and
  returns the content as a string.
  
  @param connection
  The connection to the Amazon EC2 Instance Metadata Service.
  
  @return The content contained in the response from the Amazon EC2
  Instance Metadata Service.
  
  @throws IOException
  If any problems ocurred while reading the response.