static FeignException errorReading(Request request, Response response, IOException cause) {
    return new FeignException(
        response.status(),
        format("%s reading %s %s", cause.getMessage(), request.httpMethod(), request.url()),
        request,
        cause,
        request.body(),
        request.headers());
  }
The Response body.

@return an Optional wrapping the response body.
core/src/main/java/feign/FeignException.java