diff --git a/Gemfile b/Gemfile
index 20e4498e..92afc60f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -16,6 +16,7 @@ gem 'highline'
 gem 'i18n-js'
 gem 'ims-lti', '< 2.0.0'
 gem 'jbuilder'
+gem 'js-routes'
 gem 'kramdown'
 gem 'mimemagic'
 gem 'nokogiri'
diff --git a/Gemfile.lock b/Gemfile.lock
index 8abfb583..61cb373b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -216,6 +216,8 @@ GEM
       thor (>= 0.14, < 2.0)
     jquery-ui-rails (6.0.1)
       railties (>= 3.2.16)
+    js-routes (2.0.7)
+      railties (>= 4)
     json (2.3.1)
     jwt (2.2.3)
     kaminari (1.2.1)
@@ -554,6 +556,7 @@ DEPENDENCIES
   i18n-js
   ims-lti (< 2.0.0)
   jbuilder
+  js-routes
   kramdown
   listen
   mimemagic
diff --git a/README.md b/README.md
index cf63dc3b..1c02bc0c 100644
--- a/README.md
+++ b/README.md
@@ -46,7 +46,8 @@ In order to execute code submissions using Docker, source code files are written
 
 ## Production Setup
 
-- We recommend using [Capistrano](http://capistranorb.com/) for deployment
+- We recommend using [Capistrano](http://capistranorb.com/) for deployment.
+- Once deployed, CodeOcean assumes to run exclusively under a (sub)domain. If you want to use it under a custom subpath, you can specify the desired path using an environment variable: `RAILS_RELATIVE_URL_ROOT=/codeocean`. Please ensure to rebuild all assets and restart the server to apply the new path.
 
 ## Monitoring
 - We use a [Prometheus Exporter](https://github.com/discourse/prometheus_exporter) and a [Telegraf Client](https://github.com/jgraichen/telegraf-ruby)
diff --git a/app/assets/javascripts/dashboard.js b/app/assets/javascripts/dashboard.js
index c8b1ae51..6ae38079 100644
--- a/app/assets/javascripts/dashboard.js
+++ b/app/assets/javascripts/dashboard.js
@@ -51,7 +51,7 @@ $(document).on('turbolinks:load', function() {
     } else {
       var jqxhr = $.ajax({
         dataType: 'json',
-        url: '/admin/dashboard',
+        url: Routes.admin_dashboard_path(),
         method: 'GET'
       });
       jqxhr.done(function(response) {
diff --git a/app/assets/javascripts/editor/editor.js.erb b/app/assets/javascripts/editor/editor.js.erb
index f94f9e16..98e095f3 100644
--- a/app/assets/javascripts/editor/editor.js.erb
+++ b/app/assets/javascripts/editor/editor.js.erb
@@ -1,7 +1,7 @@
 var CodeOceanEditor = {
     //ACE-Editor-Path
     // ruby part adds the relative_url_root, if it is set.
-    ACE_FILES_PATH: '<%= (defined? Rails.application.config.relative_url_root) && Rails.application.config.relative_url_root != nil && Rails.application.config.relative_url_root != "" ? Rails.application.config.relative_url_root : "" %>' + '/assets/ace/',
+    ACE_FILES_PATH: '<%= "#{Rails.application.config.relative_url_root.chomp('/')}/assets/ace/" %>',
     THEME: 'ace/theme/textmate',
 
     //Color-Encoding for Percentages in Progress Bars (For submissions)
diff --git a/app/assets/javascripts/editor/participantsupport.js.erb b/app/assets/javascripts/editor/participantsupport.js.erb
index ba9e03ec..af4cb501 100644
--- a/app/assets/javascripts/editor/participantsupport.js.erb
+++ b/app/assets/javascripts/editor/participantsupport.js.erb
@@ -142,7 +142,7 @@ CodeOceanEditorRequestForComments = {
     var createRequestForComments = function (submission) {
       $.ajax({
         method: 'POST',
-        url: '/request_for_comments',
+        url: Routes.request_for_comments_path(),
         data: {
           request_for_comment: {
             exercise_id: exercise_id,
diff --git a/app/assets/javascripts/exercises.js.erb b/app/assets/javascripts/exercises.js.erb
index f669951e..5ffea543 100644
--- a/app/assets/javascripts/exercises.js.erb
+++ b/app/assets/javascripts/exercises.js.erb
@@ -1,6 +1,6 @@
 $(document).on('turbolinks:load', function () {
     // ruby part adds the relative_url_root, if it is set.
-    var ACE_FILES_PATH = '<%= (defined?  Rails.application.config.relative_url_root) &&  Rails.application.config.relative_url_root != nil &&  Rails.application.config.relative_url_root != "" ?  Rails.application.config.relative_url_root : "" %>' + '/assets/ace/';
+    var ACE_FILES_PATH = '<%= "#{Rails.application.config.relative_url_root.chomp('/')}/assets/ace/" %>';
     var THEME = 'ace/theme/textmate';
 
     var TAB_KEY_CODE = 9;
@@ -351,7 +351,7 @@ $(document).on('turbolinks:load', function () {
 
         return $.ajax({
             type: 'POST',
-            url: '/exercises/' + exerciseID + '/export_external_check',
+            url: Routes.export_external_check_exercise_path(exerciseID),
             dataType: 'json',
             success: function (response) {
                 $messageDiv.html(response.message);
@@ -370,7 +370,7 @@ $(document).on('turbolinks:load', function () {
 
         return $.ajax({
             type: 'POST',
-            url: '/exercises/' + exerciseID + '/export_external_confirm',
+            url: Routes.export_external_confirm_exercise_path(exerciseID),
             dataType: 'json',
             success: function (response) {
                 $messageDiv.html(response.message)
@@ -427,9 +427,8 @@ $(document).on('turbolinks:load', function () {
     };
 
     var updateFileTemplates = function (fileType) {
-        var rel_url_root = '<%= (defined?  Rails.application.config.relative_url_root) &&  Rails.application.config.relative_url_root != nil &&  Rails.application.config.relative_url_root != "" ?  Rails.application.config.relative_url_root : "" %>';
         var jqxhr = $.ajax({
-            url: rel_url_root + '/file_templates/by_file_type/' + fileType + '.json',
+            url: Routes.by_file_type_file_templates_path(fileType),
             dataType: 'json'
         });
         jqxhr.done(function (response) {
diff --git a/app/assets/javascripts/markdown_ace_editor.js b/app/assets/javascripts/markdown_ace_editor.js.erb
similarity index 82%
rename from app/assets/javascripts/markdown_ace_editor.js
rename to app/assets/javascripts/markdown_ace_editor.js.erb
index bd9845f3..9ac28df1 100644
--- a/app/assets/javascripts/markdown_ace_editor.js
+++ b/app/assets/javascripts/markdown_ace_editor.js.erb
@@ -1,5 +1,5 @@
 (function() {
-    var ACE_FILES_PATH = '/assets/ace/';
+    var ACE_FILES_PATH = '<%= "#{Rails.application.config.relative_url_root.chomp('/')}/assets/ace/" %>';
     
     window.MarkdownEditor = function(selector) {
         ace.config.set('modePath', ACE_FILES_PATH);
diff --git a/app/assets/javascripts/submission_statistics.js b/app/assets/javascripts/submission_statistics.js.erb
similarity index 97%
rename from app/assets/javascripts/submission_statistics.js
rename to app/assets/javascripts/submission_statistics.js.erb
index 71b9427f..0fab3777 100644
--- a/app/assets/javascripts/submission_statistics.js
+++ b/app/assets/javascripts/submission_statistics.js.erb
@@ -1,6 +1,6 @@
 $(document).on('turbolinks:load', function() {
 
-  var ACE_FILES_PATH = '/assets/ace/';
+  var ACE_FILES_PATH = '<%= "#{Rails.application.config.relative_url_root.chomp('/')}/assets/ace/" %>';
   var THEME = 'ace/theme/textmate';
 
   var currentSubmission = 0;
diff --git a/app/helpers/statistics_helper.rb b/app/helpers/statistics_helper.rb
index a9e669b7..4472e538 100644
--- a/app/helpers/statistics_helper.rb
+++ b/app/helpers/statistics_helper.rb
@@ -44,7 +44,7 @@ module StatisticsHelper
           data: ExternalUser.joins(:submissions)
             .where(['submissions.created_at >= ?', DateTime.now - 5.minutes])
             .distinct('external_users.id').count,
-          url: 'statistics/graphs',
+          url: statistics_graphs_path,
       },
     ]
   end
diff --git a/app/javascript/packs/application.js b/app/javascript/packs/application.js
index 8e0bd22d..cf59ed81 100644
--- a/app/javascript/packs/application.js
+++ b/app/javascript/packs/application.js
@@ -39,3 +39,7 @@ import 'jquery-ui/themes/base/core.css'
 import 'jquery-ui/themes/base/resizable.css'
 import 'jquery-ui/themes/base/selectable.css'
 import 'jquery-ui/themes/base/sortable.css'
+
+// Routes
+import * as Routes from 'routes.js.erb';
+window.Routes = Routes;
diff --git a/app/javascript/routes.js.erb b/app/javascript/routes.js.erb
new file mode 100644
index 00000000..5965eb2a
--- /dev/null
+++ b/app/javascript/routes.js.erb
@@ -0,0 +1 @@
+<%= JsRoutes.generate %>
diff --git a/app/views/request_for_comments/show.html.slim b/app/views/request_for_comments/show.html.slim
index 183ddeda..c25d8ab6 100644
--- a/app/views/request_for_comments/show.html.slim
+++ b/app/views/request_for_comments/show.html.slim
@@ -148,7 +148,7 @@ javascript:
   });
 
   // set file paths for ace
-  var ACE_FILES_PATH = '/assets/ace/';
+  var ACE_FILES_PATH = "#{Rails.application.config.relative_url_root.chomp('/')}/assets/ace/";
   _.each(['modePath', 'themePath', 'workerPath'], function(attribute) {
     ace.config.set(attribute, ACE_FILES_PATH);
   });
@@ -231,7 +231,7 @@ javascript:
     var jqrequest = $.ajax({
       dataType: 'json',
       method: 'GET',
-      url: '/comments',
+      url: Routes.comments_path(),
       data: {
         file_id: fileid
       }
@@ -254,7 +254,7 @@ javascript:
   function deleteComment(commentId, editor, file_id, callback) {
     var jqxhr = $.ajax({
       type: 'DELETE',
-      url: "/comments/" + commentId
+      url: Routes.comments_path(commentId)
     });
     jqxhr.done(function () {
       setAnnotations(editor, file_id);
@@ -266,7 +266,7 @@ javascript:
   function updateComment(commentId, text, editor, file_id, callback) {
     var jqxhr = $.ajax({
       type: 'PATCH',
-      url: "/comments/" + commentId,
+      url: Routes.comments_path(commentId),
       data: {
         comment: {
           text: text
@@ -293,7 +293,7 @@ javascript:
       },
       dataType: 'json',
       method: 'POST',
-      url:  "/comments"
+      url: Routes.comments_path()
     });
     jqxhr.done(function(){
       setAnnotations(editor, file_id);
@@ -312,7 +312,7 @@ javascript:
       },
       dataType: 'json',
       method: 'POST',
-      url:  "/subscriptions.json"
+      url: Routes.subscriptions_path({format: 'json'})
     });
     jqxhr.done(function(subscription) {
       checkbox.data('subscription', subscription.id);
@@ -329,7 +329,7 @@ javascript:
     checkbox.attr("disabled", true);
     var subscriptionId = checkbox.data('subscription');
     var jqxhr = $.ajax({
-      url:  '/subscriptions/' + subscriptionId + '/unsubscribe.json'
+      url: Routes.unsubscribe_subscription_path(subscriptionId, {format: 'json'})
     });
     jqxhr.done(function(response) {
       checkbox.prop('checked', false);
diff --git a/config.ru b/config.ru
index 6dc83218..4a160382 100644
--- a/config.ru
+++ b/config.ru
@@ -4,5 +4,7 @@
 
 require_relative 'config/environment'
 
-run Rails.application
-Rails.application.load_server
+map Rails.application.config.relative_url_root do
+  run Rails.application
+  Rails.application.load_server
+end
diff --git a/config/application.rb b/config/application.rb
index 78b2bee6..91c8782d 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -40,7 +40,9 @@ module CodeOcean
     config.autoload_paths += extra_paths
     config.eager_load_paths += extra_paths
 
-    config.action_cable.mount_path = '/cable'
+    config.relative_url_root = ENV.fetch('RAILS_RELATIVE_URL_ROOT', '/').to_s
+
+    config.action_cable.mount_path = "#{ENV.fetch('RAILS_RELATIVE_URL_ROOT', '')}/cable"
 
     config.telegraf.tags = {application: 'codeocean'}
 
diff --git a/config/environments/staging.rb b/config/environments/staging.rb
index 41a7e30a..2ad25a24 100644
--- a/config/environments/staging.rb
+++ b/config/environments/staging.rb
@@ -100,7 +100,4 @@ Rails.application.configure do
 
   # Do not dump schema after migrations.
   config.active_record.dump_schema_after_migration = false
-
-  # Run on subfolder in production environment.
-  # config.relative_url_root = '/co-staging'
 end
diff --git a/config/initializers/js_routes.rb b/config/initializers/js_routes.rb
new file mode 100644
index 00000000..2bac2935
--- /dev/null
+++ b/config/initializers/js_routes.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+JsRoutes.setup do |config|
+  config.documentation = false
+  config.prefix = Rails.application.config.relative_url_root
+  config.url_links = true
+end
diff --git a/config/initializers/session_store.rb b/config/initializers/session_store.rb
index 43ed5fc8..234f4f22 100644
--- a/config/initializers/session_store.rb
+++ b/config/initializers/session_store.rb
@@ -2,4 +2,7 @@
 
 # Be sure to restart your server when you modify this file.
 
-Rails.application.config.session_store :cookie_store, key: '_code_ocean_session', expire_after: 1.month
+Rails.application.config.session_store :cookie_store,
+  key: '_code_ocean_session',
+  expire_after: 1.month,
+  path: Rails.application.config.relative_url_root
diff --git a/config/webpack/environment.js b/config/webpack/environment.js
index 54e50536..94f7ba80 100644
--- a/config/webpack/environment.js
+++ b/config/webpack/environment.js
@@ -4,9 +4,10 @@ Info for this file can be found
 github.com/rails/webpacker/blob/master/docs/webpack.md
 */
 
-const { environment } = require('@rails/webpacker')
-const { merge } = require('webpack-merge')
+const {environment} = require('@rails/webpacker')
+const {merge} = require('webpack-merge')
 const webpack = require('webpack')
+const erb = require('./loaders/erb')
 
 // Add an additional plugin of your choosing : ProvidePlugin
 environment.plugins.prepend('Provide', new webpack.ProvidePlugin({
@@ -24,6 +25,16 @@ environment.plugins.prepend('Provide', new webpack.ProvidePlugin({
     })
 )
 
+// This setting will change the absolute path used to refer
+// external files (images, fonts, ...) in the generated assets
+const relative_url_root = process.env.RAILS_RELATIVE_URL_ROOT || '';
+const public_output_path = environment.config.output.publicPath;
+environment.loaders.get('file')
+    .use.find(item => item.loader === 'file-loader')
+    .options.publicPath = relative_url_root + public_output_path;
+
+environment.loaders.append('erb', erb)
+
 const envConfig = module.exports = environment
 const aliasConfig = module.exports = {
     resolve: {
diff --git a/config/webpack/loaders/erb.js b/config/webpack/loaders/erb.js
new file mode 100644
index 00000000..8c69c6a2
--- /dev/null
+++ b/config/webpack/loaders/erb.js
@@ -0,0 +1,16 @@
+module.exports = {
+    test: /\.erb$/,
+    enforce: "pre",
+    exclude: /node_modules/,
+
+    use: [{
+        loader: "rails-erb-loader",
+        options: {
+            runner: (/^win/.test(process.platform) ? "ruby " : "") + "bin/rails runner",
+            env: {
+                ...process.env,
+                DISABLE_SPRING: 1,
+            },
+        },
+    }],
+}
diff --git a/package.json b/package.json
index bde0a97d..cb3d971b 100644
--- a/package.json
+++ b/package.json
@@ -15,6 +15,7 @@
     "jstree": "^3.3.11",
     "opensans-webkit": "^1.1.0",
     "popper.js": "^1.16.1",
+    "rails-erb-loader": "^5.5.2",
     "sortablejs": "^1.14.0",
     "underscore": "^1.13.1",
     "vis": "^4.21.0",
diff --git a/yarn.lock b/yarn.lock
index 1fa7a7f8..5ff95dbd 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4272,6 +4272,11 @@ lodash.debounce@^4.0.8:
   resolved "https://registry.yarnpkg.com/lodash.debounce/-/lodash.debounce-4.0.8.tgz#82d79bff30a67c4005ffd5e2515300ad9ca4d7af"
   integrity sha1-gteb/zCmfEAF/9XiUVMArZyk168=
 
+lodash.defaults@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/lodash.defaults/-/lodash.defaults-4.2.0.tgz#d09178716ffea4dde9e5fb7b37f6f0802274580c"
+  integrity sha1-0JF4cW/+pN3p5ft7N/bwgCJ0WAw=
+
 lodash.get@^4.0:
   version "4.4.2"
   resolved "https://registry.yarnpkg.com/lodash.get/-/lodash.get-4.4.2.tgz#2d177f652fa31e939b4438d5341499dfa3825e99"
@@ -5879,6 +5884,14 @@ querystringify@^2.1.1:
   resolved "https://registry.yarnpkg.com/querystringify/-/querystringify-2.2.0.tgz#3345941b4153cb9d082d8eee4cda2016a9aef7f6"
   integrity sha512-FIqgj2EUvTa7R50u0rGsyTftzjYmv/a3hO345bZNrqabNqjtgiDMgmo4mkUjd+nzU5oF3dClKqFIPUKybUyqoQ==
 
+rails-erb-loader@^5.5.2:
+  version "5.5.2"
+  resolved "https://registry.yarnpkg.com/rails-erb-loader/-/rails-erb-loader-5.5.2.tgz#db3fa8ac89600f09d179a1a70a2ca18c592576ea"
+  integrity sha512-cjQH9SuSvRPhnWkvjmmAW/S4AFVDfAtYnQO4XpKJ8xpRdZayT73iXoE+IPc3VzN03noZXhVmyvsCvKvHj4LY6w==
+  dependencies:
+    loader-utils "^1.1.0"
+    lodash.defaults "^4.2.0"
+
 randombytes@^2.0.0, randombytes@^2.0.1, randombytes@^2.0.5, randombytes@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/randombytes/-/randombytes-2.1.0.tgz#df6f84372f0270dc65cdf6291349ab7a473d4f2a"