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Use Apache as Proxy and to Rewrite Requested Host

I am trying to use an Apache server for two very limited purposes. There is a single, dedicated device (Black Box) on a local network which makes calls to a remote original.host.com. I wish to use Apache on this local network as a proxy that will also substitute my.newhost.com for original.host.com when Black Box requests service. The Black Box allows me to specify a proxy server but does not allow me to change its target host for the HTTP service requests.

Black Box makes only two very specific requests:
http://original.host.com/rectrack/file_name.php?data_1=text_string_1
and
http://original.host.com/rectrack/file_name.php?data_1=text_string_1&data_2=text_string_2

which I wish to change to:
http://my.newhost.com/rectrack/file_name.php?data_1=text_string_1
and
http://my.newhost.com/rectrack/file_name.php?data_1=text_string_1&data_2=text_string_2

Using .htaccess I am successfully able to configure Apache as a proxy so this function works.

I have tried using the following rewriteRule (as well as many variations) to substitute my.newhost.com for original.host.com, but I can’t seem to get Apache to actually make the substitution:

LoadModule rewrite_module modules/mod_rewrite.so
RewriteEngine on
RewriteCond %{HTTP_HOST} original.host.com
RewriteRule   ^(.*)  http://my.newhost.com/$1

Does anyone have any idea what I might be doing wrong?

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Socks5 Proxy Service Cheap Socks5

nginx docker proxy reverse not displaying custom html page

I’m trying to setup a reverse proxy docker image which displays a custom static page on path “/” and proxies the incoming request to other services, but it’s not working.
This is my nginx.config:

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    server_name localhost;

    root /usr/share/nginx/html;
    index index.html;

    location / {
        try_files $uri $uri/ /index.html;
    }

    location /my-service {
        proxy_pass          http://my-server:8080/;
        proxy_set_header    X-Forwarded-For $remote_addr;
    }

}

and this is my Dockerfile

FROM nginx:latest
COPY ./nginx-html-template/ /usr/share/nginx/html/
COPY ./nginx.conf /etc/nginx/conf.d/nginx.conf
EXPOSE 80
CMD ["nginx", "-g", "daemon off;", "-c", "/etc/nginx/nginx.conf"]

upon hitting localhost on my device I just get an ERR_CONNECTION_REFUSED error.

this are the commands I use to build the image and run:

docker build -t my-nginx .
docker run -it --rm -d -p 8080:80 --name localhost my-nginx

Have you got any idea? I have run out of options

Why would I need to proxy to the backend?

I was reading Angular docs lately and started reading about proxying. (https://angular.io/guide/build#proxying-to-a-backend-server), but I couldnt find the reasons why to proxy in the first place.
So as in the title, why would I need to proxy to the backend?