diff --git a/docs/3.0.0-beta.x/advanced/customize-admin.md b/docs/3.0.0-beta.x/advanced/customize-admin.md
index cde17e6446..5db4df0f71 100644
--- a/docs/3.0.0-beta.x/advanced/customize-admin.md
+++ b/docs/3.0.0-beta.x/advanced/customize-admin.md
@@ -118,9 +118,8 @@ It's very common to deploy the front-end and the back-end on different servers.
     "enabled": false
   },
   "admin": {
-    "path": "/dashboard",
+    "path": "/", // Note: The administration will be accessible from the root of the domain (ex: http//yourfrontend.com/)
     "build": {
-      "host": "/",  // Note: The administration will be accessible from the root of the domain (ex: http//yourfrontend.com/)
       "backend": "http://yourbackend.com"
     }
   }
@@ -146,8 +145,8 @@ In this case, we suppose that you decided to put your administration panel on a
     "enabled": false
   },
   "admin": {
+    "path": "/dashboard",
     "build": {
-      "host": "http://yourfrontend.com/dashboard", // Note: The custom path has moved directly in the host URL.
       "backend": "http://yourbackend.com"
     }
   }
diff --git a/packages/strapi-admin/admin/src/app.js b/packages/strapi-admin/admin/src/app.js
index e2237060e1..d3b2707245 100644
--- a/packages/strapi-admin/admin/src/app.js
+++ b/packages/strapi-admin/admin/src/app.js
@@ -90,11 +90,7 @@ Object.keys(plugins).forEach(plugin => {
 
 // TODO
 const remoteURL = (() => {
-  if (window.location.port === '4000') {
-    return 'http://localhost:4000/admin';
-  }
-
-  // Relative URL (ex: /dashboard)
+    // Relative URL (ex: /dashboard)
   if (REMOTE_URL[0] === '/') {
     return (window.location.origin + REMOTE_URL).replace(/\/$/, '');
   }
diff --git a/packages/strapi-admin/index.js b/packages/strapi-admin/index.js
index b23d019053..f95ef139ef 100644
--- a/packages/strapi-admin/index.js
+++ b/packages/strapi-admin/index.js
@@ -15,7 +15,7 @@ function createPluginsJs(plugins, dest) {
 
     window.strapi = Object.assign(window.strapi || {}, {
       node: MODE || 'host',
-      backendURL: BACKEND_URL,
+      backendURL: BACKEND_URL === '/' ? window.location.origin : BACKEND_URL,
       languages,
       currentLanguage:
       window.localStorage.getItem('strapi-admin-language') ||