I created a similar idea a while back when Gmail started caching images. The main advantage is the image itself contains the log: http://cache-logger.herokuapp.

I created a similar idea a while back when Gmail started caching images. The main advantage is the image itself contains the log: http://cache-logger.herokuapp.com/hello-world http://cache-logger.herokuapp.com/hello-world Code can be found here: https://github.com/kale/image-cache-logger https://github.com/kale/image-cache-logger