在提供存储在Web根目录之外的照片时，我使用什么URL？

I'm new to web development and I'm trying to figure out how to serve photos that are stored outside the web root. I know that I shouldn't store photos (that were uploaded by the user) inside the web root for security reasons, but this seems to present a problem. How do I show users these photos? Here is what I have so far:I'm new to web development and I'm trying to fi