A 404 on a website is a very common issue.
Example 1 : put a link to a survey on another website, some year after : delete the survey : 404
Example 2 : try to see the content (with your browser) of /upload/ directory
Maybe not you, but robots and user : surely
Example 1 : put a link to a survey on another website, some year after : delete the survey : 404
Example 2 : try to see the content (with your browser) of /upload/ directory
Maybe not you, but robots and user : surely
