As you may have noticed in the cases we studied in this chapter, the process of setting up a web application can sometimes be long and complex. But when it comes to the part that concerns Nginx, configuration is usually pretty simple and straightforward: a couple of directives in a server block, reload the server, and you're done.
Unfortunately, in some cases, while your initial configuration seems to do the trick, you realize over time that your visitors run into a variety of problems or are presented with unexpected error pages. The next chapter will prepare you to face such issues by exploring several leads, should you ever need to troubleshoot your web server.
