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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