Documentation: add reverse proxy examples for Docker images

Closes https://github.com/shaarli/Shaarli/issues/888

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

doc/md/docker/reverse-proxy-configuration.md

@@ -1,6 +1,120 @@
+## Foreword
+
+This guide assumes that:
+
+- Shaarli runs in a Docker container
+- The host's `10080` port is mapped to the container's `80` port
+- Shaarli's Fully Qualified Domain Name (FQDN) is `shaarli.domain.tld`
+- HTTP traffic is redirected to HTTPS
+
+## Apache
+
+- [Apache 2.4 documentation](https://httpd.apache.org/docs/2.4/)
+    - [mod_proxy](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html)
+    - [Reverse Proxy Request Headers](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#x-headers)
+
+The following HTTP headers are set by using the `ProxyPass` directive:
+
+- `X-Forwarded-For`
+- `X-Forwarded-Host`
+- `X-Forwarded-Server`
+
+```apache
+<VirtualHost *:80>
+    ServerName shaarli.domain.tld
+    Redirect permanent / https://shaarli.domain.tld
+</VirtualHost>
+
+<VirtualHost *:443>
+    ServerName shaarli.domain.tld
+
+    SSLEngine on
+    SSLCertificateFile    /path/to/cert
+    SSLCertificateKeyFile /path/to/certkey
+
+    LogLevel warn
+    ErrorLog  /var/log/apache2/shaarli-error.log
+    CustomLog /var/log/apache2/shaarli-access.log combined
+
+    RequestHeader set X-Forwarded-Proto "https"
+
+    ProxyPass        / http://127.0.0.1:10080/
+    ProxyPassReverse / http://127.0.0.1:10080/
+</VirtualHost>
+```
 
-TODO, see https://github.com/shaarli/Shaarli/issues/888
 
 ## HAProxy
 
+- [HAProxy documentation](https://cbonte.github.io/haproxy-dconv/)
+
+```conf
+global
+    [...]
+
+defaults
+    [...]
+
+frontend http-in
+    bind :80
+	redirect scheme https code 301 if !{ ssl_fc }
+
+	bind :443 ssl crt /path/to/cert.pem
+
+	default_backend shaarli
+
+
+backend shaarli
+    mode http
+    option http-server-close
+    option forwardfor
+    reqadd X-Forwarded-Proto: https
+
+    server shaarli1 127.0.0.1:10080
+```
+
+
 ## Nginx
+
+- [Nginx documentation](https://nginx.org/en/docs/)
+
+```nginx
+http {
+    [...]
+
+    index index.html index.php;
+
+    root        /home/john/web;
+    access_log  /var/log/nginx/access.log;
+    error_log   /var/log/nginx/error.log;
+
+	server {
+		listen       80;
+		server_name  shaarli.domain.tld;
+		return       301 https://shaarli.domain.tld$request_uri;
+	}
+
+	server {
+		listen       443 ssl http2;
+		server_name  shaarli.domain.tld;
+
+        ssl_certificate       /path/to/cert
+        ssl_certificate_key   /path/to/certkey
+
+		location / {
+			proxy_set_header  X-Real-IP         $remote_addr;
+			proxy_set_header  X-Forwarded-For   $proxy_add_x_forwarded_for;
+			proxy_set_header  X-Forwarded-Proto $scheme;
+			proxy_set_header  X-Forwarded-Host  $host;
+
+			proxy_pass             http://localhost:10080/;
+			proxy_set_header Host  $host;
+			proxy_connect_timeout  30s;
+			proxy_read_timeout     120s;
+
+			access_log      /var/log/nginx/shaarli.access.log;
+			error_log       /var/log/nginx/shaarli.error.log;
+		}
+	}
+}
+```