feat: Add user customizable default root response

test/test_virtual-path/test_custom_conf.yml

@@ -0,0 +1,24 @@
+web1:
+  image: web
+  expose:
+    - "81"
+  environment:
+    WEB_PORTS: "81"
+    VIRTUAL_HOST: "nginx-proxy.test"
+    VIRTUAL_PATH: "/web1/"
+
+web2:
+  image: web
+  expose:
+    - "82"
+  environment:
+    WEB_PORTS: "82"
+    VIRTUAL_HOST: "nginx-proxy.test"
+    VIRTUAL_PATH: "/web2/"
+sut:
+  image: nginxproxy/nginx-proxy:test
+  environment:
+    DEFAULT_ROOT: 418
+  volumes:
+    - /var/run/docker.sock:/tmp/docker.sock:ro
+    - ../lib/ssl/dhparam.pem:/etc/nginx/dhparam/dhparam.pem:ro