PUBLIC MARKS with tags cache & image

For example, an image with the src: “http://mysite.com/i.jpg” will be replaced by Gmail with a URL something like this: https://ci3.googleusercontent.com/proxy/…#http://mysite.com/i.jpg

ealing with browser caching is a balancing act. On one hand, you aim to minimize load times and bandwidth use by ensuring that images, scripts, and style sheets are cached by your visitors; however, you still want to ensure that they’re accessing the most recent versions of all your files. In this article, I’ll show you a few methods for controlling how your site’s files are cached by browsers so you can achieve the best of both worlds: maintaining optimal performance while ensuring that any updates are seen immediately, without a hitch by all of your users.