There are two places a trailing slash matters:

1. After a location rule;
2. After proxy_pass .

Test URL: https://www.xxxx.com/minio/ucenter/imgs/885058fa-dff6-4d60-875d-bb7dd2098ce9.png

For location , the first case:

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    location /minio/ {
        proxy_pass http://minio/;
    }

Conclusion: with or without the slash on location makes no difference.

Second case, variant 1:

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    location /minio/ {
        proxy_pass http://minio/;
    }

The backend address actually requested: 127.0.0.1:9000/ucenter/imgs/885058fa-dff6-4d60-875d-bb7dd2098ce9.png

Second case, variant 2:

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    location /minio/ {
        proxy_pass http://minio;
    }

The backend address actually requested: 127.0.0.1:9000/minio/ucenter/imgs/885058fa-dff6-4d60-875d-bb7dd2098ce9.png

Conclusion: a trailing slash on proxy_pass strips the location path prefix; without it, the location prefix is preserved.