feat: Nginx configurable X-Forwarded-Port

Signed-off-by: Fabian 'xx4h' Sylvester <xx4h@xx4h.de>

Author: xx4h

nginx/Dockerfile

@@ -183,6 +183,7 @@ ENV \
     MODSEC_UPLOAD_KEEP_FILES=Off \
     NGINX_ALWAYS_TLS_REDIRECT=off \
     NGINX_ENVSUBST_OUTPUT_DIR=/etc/nginx \
+    NGINX_X_FORWARDED_PORT='$server_port' \
     NGINX_X_FORWARDED_PROTO='$scheme' \
     PORT=8080 \
     PROXY_SSL_CERT_FILE=/etc/nginx/conf/proxy.crt \

nginx/Dockerfile-alpine

@@ -184,6 +184,7 @@ ENV \
     MODSEC_UPLOAD_KEEP_FILES=Off \
     NGINX_ALWAYS_TLS_REDIRECT=off \
     NGINX_ENVSUBST_OUTPUT_DIR=/etc/nginx \
+    NGINX_X_FORWARDED_PORT='$server_port' \
     NGINX_X_FORWARDED_PROTO='$scheme' \
     PORT=8080 \
     PROXY_SSL_CERT_FILE=/etc/nginx/conf/proxy.crt \

nginx/templates/includes/proxy_backend.conf.template

@@ -4,7 +4,7 @@ proxy_set_header Upgrade $http_upgrade;
 proxy_set_header Connection $connection_upgrade;
 proxy_set_header ${REAL_IP_PROXY_HEADER} $remote_addr;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
-proxy_set_header X-Forwarded-Port $server_port;
+proxy_set_header X-Forwarded-Port ${NGINX_X_FORWARDED_PORT};
 proxy_set_header X-Forwarded-Proto ${NGINX_X_FORWARDED_PROTO};
 
 proxy_http_version 1.1;