NGINX Proxy pass replace PNG file

[Jason Prouty]

Is it possible to replace an PNG file with a local image
I want to reverse proxy to site and then change the image returned

I have tried the sub_filter setting but nothing changes.


server {
    server_name test1.example1.com;

location /{
    proxy_ssl_server_name on;
    proxy_pass   https://test1.example2.com;
    sub_filter '<img src="https://test1.example2.com/assets/images/image1.png' '<img src="https://test1.example1.com/image1.png';
    sub_filter_once on;
    }

I just want to replace the image of  the proxied https://test1.example2.com;<https://esim.jcius.com/assets/images/powered-by-dark.png>
https://test1.example2.com/assets/images/image1.png
with
a new image hosted locally on my nginx


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