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Accepted
Christian
Asked: 2019-01-15 19:01:38 +0800 CST

nginx redirect static file request if 404

  • 772

I'm trying to redirect only static file requests from a particular directory prefix when they 404.

I've tried using try_files and it may well work still but it hasn't for me so far.

This is the scenario;

Request is for https://example.com/forums/uploads/file.jpg File 404's Redirect to https://cdn.example.com/file.jpg

It's the change in path that I'm finding tricky.

I don't think it's possible, but a check for a non 404 on the CDN would be great also.

Solution (Based on accepted answer);

location ~* /forums/uploads {
    try_files $uri @rewriteimages;
}
location @rewriteimages {
    rewrite ^/forums/uploads(.*)$ https://cdn.example.com$1 redirect;
}
nginx

1 Answers

  1. Best Answer

    You want to check for the existence of a local file and redirect the client to an external URL if that file does not exist.

    You can use try_files to test for the existence of a local file, and rewrite to redirect the client to the external URL.

    For example:

    location /forums/uploads/
    try_files $uri @rewrite;
}
location @rewrite {
    rewrite ^/forums/uploads(.*)$ https://cdn.example.com$1 redirect;
}

    See this document for more.

    I don't think it's possible, but a check for a non 404 on the CDN would be great also.

    Nginx takes no part in resolving the URL after it is redirected to the CDN.

    • 2