Setup your own cors-anywhere proxy (Ubuntu, using Let's Encrypt)

cors-anywhere-setup.sh

#!/bin/bash
# Use sudo plz

# CONFIGURATION, EDIT PLEASE
ALLOWED_DOMAINS=https://localhost:5000
CORS_DOMAIN=cors.example.com

# Install dependencies
apt install npm

# Set up project
mkdir /opt
cd /opt
git clone https://github.com/Rob--W/cors-anywhere.git
cd /opt/cors-anywhere
npm install

# Make server.js runnable
echo '#!/usr/bin/env node' | cat - /opt/cors-anywhere/setup.js > temp && mv temp /opt/cors-anywhere/setup.js
chmod +x /opt/cors-anywhere/setup.js

# Set up service
cat <<EOT >> /etc/systemd/system/cors-anywhere.service
[Unit]
Description=CORS Anywhere Proxy

[Service]
ExecStart=/opt/cors-anywhere/server.js
Restart=always
User=nobody
Group=nogroup
Environment=PATH=/usr/bin:/usr/local/bin
Environment=PORT=8080
Environment=CORSANYWHERE_WHITELIST=$ALLOWED_DOMAINS
WorkingDirectory=/opt/cors-anywhere

[Install]
WantedBy=multi-user.target
EOT

# Install Caddy
curl -o /usr/bin/caddy -s 'https://caddyserver.com/api/download?os=linux&arch=amd64'
chmod +x /usr/bin/caddy
groupadd --system caddy
useradd --system --gid caddy --create-home --home-dir /var/lib/caddy --shell /usr/sbin/nologin \
    --comment "Caddy web server" caddy

# Create Caddy service
curl -o /etc/systemd/system/caddy.service -s 'https://raw.githubusercontent.com/caddyserver/dist/master/init/caddy.service'

# Create Caddy configuration
mkdir /etc/caddy
cat <<EOT >> /etc/caddy/Caddyfile
$CORS_DOMAIN:443 {
   reverse_proxy 127.0.0.1:8080
}

$CORS_DOMAIN:80 {
   reverse_proxy 127.0.0.1:8080
}
EOT

# Start Caddy
systemctl enable caddy
systemctl start caddy

# Forward from port 80 so you can run it as unprivileged user
# This is only necessary if you want to avoid caddy, but then you don't get HTTPS
#iptables -t nat -A PREROUTING -p tcp --dport 80 -j REDIRECT --to-port 8080

This lets you create a simple cors-anywhere proxy (with whitelist) on port 80, managed by systemd.

Hi, try to use this script but dosn't work. Thanks.

@PeWe79: that seems plausible as it's been a few years since I tried it on a new system.
Any idea at what steps is stops working and what error message you're getting?