Request | Response. That is the ordinary flow of HTTP(s) communications.
Embedded in each Request, is the Prefix of interest you would like the web
server, in this case NginX, to consider. NginX searches for Locations that
are ideal and processes the rule(s) therein, rendering fabulous HTML, even if
error-bound. Locations map web space, to File System (FS), and other spaces.
Spend a bit studying NginX Locations in this release.