Server crashes? How did you get a server to work in the first place?
Just to clarify, Netlify can’t listen for your requests, etc. You can roughly think of it as a cloud storage but only for small HTML, CSS, JS files. They can only be downloaded by the end user. The closest thing to what is being requested here is Netlify Functions as I mentioned above. Read more here: [Support Guide] Can I run a web server, HTTP listener, and/or database at Netlify?