Current state

nginx/snippets/authelia-authrequest.conf

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+## Send a subrequest to Authelia to verify if the user is authenticated and has permission to access the resource.
+auth_request /internal/authelia/authz;
+
+## Save the upstream metadata response headers from Authelia to variables.
+auth_request_set $user $upstream_http_remote_user;
+auth_request_set $groups $upstream_http_remote_groups;
+auth_request_set $name $upstream_http_remote_name;
+auth_request_set $email $upstream_http_remote_email;
+
+## Inject the metadata response headers from the variables into the request made to the backend.
+proxy_set_header Remote-User $user;
+proxy_set_header Remote-Groups $groups;
+proxy_set_header Remote-Email $email;
+proxy_set_header Remote-Name $name;
+
+## Configure the redirection when the authz failure occurs. Lines starting with 'Modern Method' and 'Legacy Method'
+## should be commented / uncommented as pairs. The modern method uses the session cookies configuration's authelia_url
+## value to determine the redirection URL here. It's much simpler and compatible with the mutli-cookie domain easily.
+
+## Modern Method: Set the $redirection_url to the Location header of the response to the Authz endpoint.
+auth_request_set $redirection_url $upstream_http_location;
+
+## Modern Method: When there is a 401 response code from the authz endpoint redirect to the $redirection_url.
+error_page 401 =302 $redirection_url;
+
+## Legacy Method: Set $target_url to the original requested URL.
+## This requires http_set_misc module, replace 'set_escape_uri' with 'set' if you don't have this module.
+# set_escape_uri $target_url $scheme://$http_host$request_uri;
+
+## Legacy Method: When there is a 401 response code from the authz endpoint redirect to the portal with the 'rd'
+## URL parameter set to $target_url. This requires users update 'auth.example.com/' with their external authelia URL.
+# error_page 401 =302 https://auth.example.com/?rd=$target_url;

nginx/snippets/authelia-location.conf

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+set $upstream_authelia http://authelia:9091/api/authz/auth-request;
+
+## Virtual endpoint created by nginx to forward auth requests.
+location /internal/authelia/authz {
+    ## Essential Proxy Configuration
+    internal;
+    proxy_pass $upstream_authelia;
+
+    ## Headers
+    ## The headers starting with X-* are required.
+    proxy_set_header X-Original-Method $request_method;
+    proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
+    proxy_set_header X-Forwarded-For $remote_addr;
+    proxy_set_header Content-Length "";
+    proxy_set_header Connection "";
+
+    ## Basic Proxy Configuration
+    proxy_pass_request_body off;
+    proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; # Timeout if the real server is dead
+    proxy_redirect http:// $scheme://;
+    proxy_http_version 1.1;
+    proxy_cache_bypass $cookie_session;
+    proxy_no_cache $cookie_session;
+    proxy_buffers 4 32k;
+    client_body_buffer_size 128k;
+
+    ## Advanced Proxy Configuration
+    send_timeout 5m;
+    proxy_read_timeout 240;
+    proxy_send_timeout 240;
+    proxy_connect_timeout 240;
+}

nginx/snippets/letsencrypt.conf

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+# Content Security Policy
+# See: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP
+# Enforces https content and restricts JS/CSS to origin
+# External Javascript (such as cast_sender.js for Chromecast) must be whitelisted.
+# add_header Content-Security-Policy "default-src https: data: blob: ; img-src 'self' https://* ; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline' https://www.gstatic.com https://www.youtube.com blob:; worker-src 'self' blob:; connect-src 'self'; object-src 'none'; frame-ancestors 'self'; font-src 'self'";
+
+## The default `client_max_body_size` is 1M, this might not be enough for some posters, etc.
+client_max_body_size 20M;
+
+ssl_certificate /etc/letsencrypt/live/loadingm.xyz/fullchain.pem;
+ssl_certificate_key /etc/letsencrypt/live/loadingm.xyz/privkey.pem;
+# include /etc/letsencrypt/options-ssl-nginx.conf;
+# ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem;
+ssl_trusted_certificate /etc/letsencrypt/live/loadingm.xyz/chain.pem;
+
+# Security / XSS Mitigation Headers
+add_header X-Content-Type-Options "nosniff";
+
+# Permissions policy. May cause issues with some clients
+add_header Permissions-Policy "accelerometer=(), ambient-light-sensor=(), battery=(), bluetooth=(), camera=(), clipboard-read=(), display-capture=(), document-domain=(), encrypted-media=(), gamepad=(), geolocation=(), gyroscope=(), hid=(), idle-detection=(), interest-cohort=(), keyboard-map=(), local-fonts=(), magnetometer=(), microphone=(), payment=(), publickey-credentials-get=(), serial=(), sync-xhr=(), usb=(), xr-spatial-tracking=()" always;
+
+location /.well-known/acme-challenge/ {
+    root /var/www/certbot;
+}
+

nginx/snippets/proxy.conf

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+## Headers
+proxy_set_header Host $host;
+proxy_set_header X-Original-URL $scheme://$http_host$request_uri;
+proxy_set_header X-Forwarded-Proto $scheme;
+proxy_set_header X-Forwarded-Host $http_host;
+proxy_set_header X-Forwarded-URI $request_uri;
+proxy_set_header X-Forwarded-Ssl on;
+proxy_set_header X-Forwarded-For $remote_addr;
+proxy_set_header X-Real-IP $remote_addr;
+
+## Basic Proxy Configuration
+client_body_buffer_size 128k;
+proxy_next_upstream error timeout invalid_header http_500 http_502 http_503; ## Timeout if the real server is dead.
+proxy_redirect  http://  $scheme://;
+proxy_http_version 1.1;
+proxy_cache_bypass $cookie_session;
+proxy_no_cache $cookie_session;
+proxy_buffers 64 256k;
+
+## Trusted Proxies Configuration
+## Please read the following documentation before configuring this:
+##     https://www.authelia.com/integration/proxies/nginx/#trusted-proxies
+# set_real_ip_from 10.0.0.0/8;
+# set_real_ip_from 172.16.0.0/12;
+# set_real_ip_from 192.168.0.0/16;
+# set_real_ip_from fc00::/7;
+real_ip_header X-Forwarded-For;
+real_ip_recursive on;
+
+## Advanced Proxy Configuration
+send_timeout 5m;
+proxy_read_timeout 360;
+proxy_send_timeout 360;
+proxy_connect_timeout 360;

nginx/snippets/websockets.conf

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+## WebSocket Example
+proxy_set_header Upgrade $http_upgrade;
+proxy_set_header Connection "upgrade";