code: public String readResource(URI endpoint) throws IOException {
          return readResource(endpoint, CredentialsEndpointRetryPolicy.NO_RETRY, null);
      }
docs: Connects to the given endpoint to read the resource
  and returns the text contents.
  
  If the connection fails, the request will not be retried.
  
  @param endpoint
  The service endpoint to connect to.
  
  @return The text payload returned from the Amazon EC2 endpoint
  service for the specified resource path.
  
  @throws IOException
  If any problems were encountered while connecting to the
  service for the requested resource path.
  @throws SdkClientException
  If the requested service is not found.