For legacy reasons, I have URLs like
https://host.example.com/foo.cgi?id=nnn. I want
/foo.cgi?id=nnn to respond with the contents of a file
nnn is a number that varies.
In nginx, how do I define a custom mapping from URL paths to different file paths without generating redirects? (That is, while I want the contents of
nnn.html to be served, I want the browser-visible URL to continue to be