Content rot has a tendency to creep up on you as a website or application ages. The last thing your visitors want when they reach your site after clicking a link is to be face planted with a 404 error. To make matters worse, too many 404s will have an impact on your search engine site rankings.  We can battle 404s with redirect rules written in our Nginx configurations. The rules can either suggest to the web browser, search engine and anything that the content has permanently moved, or we suggest the content has only moved temporarily. Either way, you have chance to guide the user to the new location of your content in transparent manner.

https://uneex.org/LecturesCMC/PythonIntro2020/09_RegularExpressions