Caddy Server Reverse Proxy

"Caddy, sometimes clarified as the Caddy web server, is an open source, HTTP/2-enabled web server written in Go. It uses the Go standard library for its HTTP functionality. One of Caddy's most notable features is enabling HTTPS by default. It is the first general-purpose web server to do so without requiring extra configuration"

This guide is to help setup a reverse proxy for your slot with free SSL security from Lets Encrypt. You will need your own domain and it will need to be managed by Cloudflare. There are other ways to get this working but this guide will assume you own a domain and have it in your own Cloudflare account.

Installation

Downloading the server

Create the needed directories
```
 mkdir ~/caddy
```
Change to the directory
```
 cd ~/caddy
```

Download the latest version of the Caddy Server

 wget "https://caddyserver.com/download/linux/amd64?plugins=tls.dns.cloudflare&license=personal"

Extract the download'

 tar xzvf 'amd64?plugins=tls.dns.cloudflare&license=personal'

Clean up

 rm -rf 'amd64?plugins=tls.dns.cloudflare&license=personal'

Configuration

Create the configuration file
```
 touch ~/caddy/Caddyfile
```
Edit the config
```
 nano ~/caddy/Caddyfile
```

Copy in the example config

 **my.domain.com** {
 tls {
 dns cloudflare
 }
 gzip
 proxy /**site** localhost:**52194**
 proxy /**site** localhost:**52195**
 proxy /**site** localhost:**52196** {
 transparent
         }
 }

Adust the bold values to enter your own domain/sub-domain, the site value is what needs to be entered after the domain to access the service. In this example, https://my.domain.com/site would display whatever service was running at localhost:52194 More proxy sites can be added by adding additional lines (proxy /site localhost:52194) as long as formatting is kept.

Starting the server

Users do no not have root access so a few changes need to be made to ensure things can run.
Setup Cloudflare details for screen to use
```
 nano ~/.screenrc
```

Copy in the below and edit to match your own details

 setenv CLOUDFLARE_EMAIL abc
 setenv CLOUDFLARE_API_KEY 123

Now run the server in screen, random ports have been set for your use.

 screen -dmS caddy ~/caddy/caddy -conf ~/caddy/Caddyfile -http-port 48718 -https-port 24359

You will need to accept the terms on the first run and provide your email address for Lets Encrypt
```
 screen -r caddy
 
 then *ctrl + a*, then *d* to exit the screen but not stop it running
```
Service should be avaible at
```
 https://my.domain.com/site:24359
```