[Help] How to access images processed by Nginx + Image Proxy extension through imgproxy?

## How to access images processed by Nginx + Image Proxy extension through imgproxy?

Thank you very much to the FreshRSS team and the Image Proxy extension developer.

I have a requirement to compress images from feeds using imgproxy. I have already solved part of the cross-domain issue for feed images through nginx + Image Proxy extension, but some images are too large and load too slowly. Therefore, I want to convert them first, such as converting them to webp/avif. However, after debugging my Nginx configuration for three days, I still can't solve it and need help.

### My docker imgproxy
```
imgproxy:
image: darthsim/imgproxy:latest
environment:
- IMGPROXY_QUALITY=80
- IMGPROXY_FORMAT_QUALITY=jpeg=85,webp=75,avif=65
- IMGPROXY_AUTO_WEBP=true
- IMGPROXY_AUTO_AVIF=true
- IMGPROXY_ENFORCE_AVIF=true
- IMGPROXY_TTL=2592000
- IMGPROXY_USE_ETAG=true
- IMGPROXY_MAX_SRC_RESOLUTION=50
- IMGPROXY_MAX_SRC_FILE_SIZE=20971520
- IMGPROXY_CACHE_CONTROL_PASSTHROUGH=true
- IMGPROXY_JPEG_PROGRESSIVE=true
- IMGPROXY_PNG_INTERLACED=true
- IMGPROXY_ALLOW_ORIGIN= "*"
volumes:
- ./Shanghai:/etc/localtime:ro
restart: unless-stopped
```

## This is my imgproxy nginx configuration
```
map $http_accept $preferred_format {
~*avif "avif";
~*webp "webp";
default "original";
}

server {
listen 5023;
server_name myrss.com;

location /imgproxy {
if ($arg_key != "xxxxxxxxxxxxx") {
return 404;
}
proxy_pass http://imgproxy-ip:8080/insecure/plain/http://imgproxy-geteway-ip:5022/proxy?url=$arg_url;

proxy_set_header Accept "image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8";

proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Real-Port $remote_port;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header HTTP_X_FORWARDED_FOR $remote_addr;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header Host $host;
proxy_set_header X-NginX-Proxy true;

proxy_redirect ~^(.*)$ https://myrss.com/imgproxy?key=$arg_key&url=$1;
proxy_ssl_server_name on;

set_real_ip_from 0.0.0.0/24;
real_ip_header X-Forwarded-For;
real_ip_recursive on;

}

location =/robots.txt {
default_type text/html;
add_header Content-Type "text/plain; charset=UTF-8";
return 200 "User-Agent: *\nDisallow: /";
}

access_log /var/log/nginx/imgproxy-access.log;
error_log /var/log/nginx/imgproxy-error.log;
}
```

## My freshrss-imageproxy Nginx configuration
```
server {
listen 5022;
server_name myrss.com;

location /proxy {
if ($arg_key = "xxxxxxxxxxxxx") {
proxy_pass $arg_url;
}
# Handle redirects coming from the target server.
proxy_redirect ~^(.*)$ https://myrss.com/proxy?key=$arg_key&url=$1;
proxy_ssl_server_name on;
}
}
```