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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.html, where 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 foo.cgi?id=nnn.)

  • Do you mean /foo.cgi?id=nnn.html or /foo.cgi?id=nnn? – Richard Smith Jun 9 at 18:38
  • Oops. I meant /foo.cgi?id=nnn. Edited question accordingly. Thank you for the answer! – hsivonen Jun 13 at 14:46
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Assuming that the URI /foo.cgi is defunct, you can use an exact match location block to process the id argument using a try_files statement.

For example:

location = /foo.cgi {
    root /path/to/files;
    try_files /$arg_id.html =404;
}

The URI /foo.cgi?id=123 will cause Nginx to search for a file at /path/to/files/123.html or return a 404 status if not found.

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