fix: Add ALLOWED_HOSTS environment variable for improved host configuration

Author: karlspace

.env.example

@@ -25,6 +25,12 @@ SECRET_KEY=GENERATE_WITH_openssl_rand_base64_50
 # DNS must resolve to this hostname
 SERVICE_HOSTNAME=error-observability.app.example.com
 
+# -- Additional Allowed Hosts (optional) --
+# Comma-separated list of additional hostnames for ALLOWED_HOSTS
+# Use when running behind a proxy that forwards a different Host header
+# Example: ALLOWED_HOSTS=alt-hostname.example.com,another.example.com
+#ALLOWED_HOSTS=
+
 # -- Docker Network --
 # Unique subnet ID (1-254) to avoid conflicts with other stacks
 PRIVATESUBNET=252

docker-compose.development.yml

@@ -25,6 +25,7 @@ services:
       - BASE_URL=https://${SERVICE_HOSTNAME}
       - BEHIND_HTTPS_PROXY=true
       - SITE_TITLE=${SITE_TITLE:-Bugsink}
+      - ALLOWED_HOSTS=${SERVICE_HOSTNAME},localhost,127.0.0.1,${ALLOWED_HOSTS:-}
 
       # Database Connection
       - DATABASE_URL=postgresql://bugsink:${DATABASE_PASSWORD}@database-server:5432/bugsink

docker-compose.traefik.yml

@@ -25,6 +25,7 @@ services:
       - BASE_URL=https://${SERVICE_HOSTNAME}
       - BEHIND_HTTPS_PROXY=true
       - SITE_TITLE=${SITE_TITLE:-Bugsink}
+      - ALLOWED_HOSTS=${SERVICE_HOSTNAME},localhost,127.0.0.1,${ALLOWED_HOSTS:-}
 
       # Database Connection
       - DATABASE_URL=postgresql://bugsink:${DATABASE_PASSWORD}@database-server:5432/bugsink

docker-compose.yml

@@ -25,6 +25,7 @@ services:
       - BASE_URL=https://${SERVICE_HOSTNAME}
       - BEHIND_HTTPS_PROXY=true
       - SITE_TITLE=${SITE_TITLE:-Bugsink}
+      - ALLOWED_HOSTS=${SERVICE_HOSTNAME},localhost,127.0.0.1,${ALLOWED_HOSTS:-}
 
       # Database Connection
       - DATABASE_URL=postgresql://bugsink:${DATABASE_PASSWORD}@database-server:5432/bugsink