diff --git a/README.md b/README.md
index 7e155db7..05042630 100644
--- a/README.md
+++ b/README.md
@@ -369,14 +369,6 @@ enabled_bridges[] = TwitchBridge
 enabled_bridges[] = GettrBridge
 ```
 
-### How to enable debug mode
-
-The 
-[debug mode](https://rss-bridge.github.io/rss-bridge/For_Developers/Debug_mode.html)
-disables the majority of caching operations.
-
-    enable_debug_mode = true
-
 ### How to switch to memcached as cache backend
 
 ```
diff --git a/actions/ConnectivityAction.php b/actions/ConnectivityAction.php
index e4e1e7c2..458a06af 100644
--- a/actions/ConnectivityAction.php
+++ b/actions/ConnectivityAction.php
@@ -22,8 +22,8 @@ class ConnectivityAction implements ActionInterface
 
     public function __invoke(Request $request): Response
     {
-        if (!Debug::isEnabled()) {
-            return new Response('This action is only available in debug mode!', 403);
+        if (Configuration::getConfig('system', 'env') !== 'dev') {
+            return new Response('This action is only available in dev environment!', 403);
         }
 
         $bridgeName = $request->get('bridge');
diff --git a/bridges/BlueskyBridge.php b/bridges/BlueskyBridge.php
index bf5053be..ada24128 100644
--- a/bridges/BlueskyBridge.php
+++ b/bridges/BlueskyBridge.php
@@ -178,10 +178,8 @@ class BlueskyBridge extends BridgeAbstract
             $postDisplayName = e($postDisplayName);
             $postUri = $item['uri'];
 
-            if (Debug::isEnabled()) {
-                $url = explode('/', $post['post']['uri']);
-                $this->logger->debug('https://bsky.app/profile/' . $url[2] . '/post/' . $url[4]);
-            }
+            $url = explode('/', $post['post']['uri']);
+            $this->logger->debug('https://bsky.app/profile/' . $url[2] . '/post/' . $url[4]);
 
             $description = '';
             $description .= '<p>';
@@ -612,9 +610,9 @@ class BlueskyBridge extends BridgeAbstract
     private function getAuthorFeed($did, $filter)
     {
         $uri = 'https://public.api.bsky.app/xrpc/app.bsky.feed.getAuthorFeed?actor=' . urlencode($did) . '&filter=' . urlencode($filter) . '&limit=30';
-        if (Debug::isEnabled()) {
-            $this->logger->debug($uri);
-        }
+
+        $this->logger->debug($uri);
+
         $response = json_decode(getContents($uri), true);
         return $response;
     }
diff --git a/config.default.ini.php b/config.default.ini.php
index ae8b23b7..39329a2a 100644
--- a/config.default.ini.php
+++ b/config.default.ini.php
@@ -6,6 +6,9 @@
 
 [system]
 
+; System environment: "dev" or "prod"
+env = "prod"
+
 ; Only these bridges are available for feed production
 ; How to enable all bridges: enabled_bridges[] = *
 ;enabled_bridges[] = CssSelectorBridge
@@ -31,13 +34,6 @@ timezone = "UTC"
 ; Display a system message to users.
 ;message = "Hello world"
 
-; Whether to enable debug mode.
-enable_debug_mode = false
-
-; Enable debug mode only for these permitted ip addresses
-; debug_mode_whitelist[] = 127.0.0.1
-; debug_mode_whitelist[] = 192.168.1.10
-
 ; Whether to enable maintenance mode. If enabled, feed requests receive 503 Service Unavailable
 enable_maintenance_mode = false
 
diff --git a/docs/04_For_Developers/05_Debug_mode.md b/docs/04_For_Developers/05_Debug_mode.md
index 7d503acd..cccf2768 100644
--- a/docs/04_For_Developers/05_Debug_mode.md
+++ b/docs/04_For_Developers/05_Debug_mode.md
@@ -1,23 +1,28 @@
-<h1 align="center">Warning!</h1>
+Debug mode has been removed.
 
-Enabling debug mode on a public server may result in malicious clients retrieving sensitive data about your server and possibly gaining access to it.
-Do not enable debug mode on a public server, unless you understand the implications of your doing!
+If you want to disable caching you can set cache type to array (in-memory cache):
 
-***
+```ini
+[cache]
 
-Debug mode enables error reporting and prevents loading data from the cache (data is still written to the cache).
-To enable debug mode, set in `config.ini.php`:
+; Cache type: file, sqlite, memcached, array, null
+type = "array"
+```
 
-    enable_debug_mode = true
+Alternatively, you can comment out the cache middleware in `lib/RssBridge.php`:
 
-Allow only explicit ip addresses:
+```diff
+diff --git a/lib/RssBridge.php b/lib/RssBridge.php
+index d16f1d89..da3df8be 100644
+--- a/lib/RssBridge.php
++++ b/lib/RssBridge.php
+@@ -24,7 +24,7 @@ final class RssBridge
 
-    debug_mode_whitelist[] = 127.0.0.1
-    debug_mode_whitelist[] = 192.168.1.10
-
-_Notice_:
-
-* An empty file enables debug mode for anyone!
-* The bridge whitelist still applies! (debug mode does **not** enable all bridges)
-
-RSS-Bridge will give you a visual feedback when debug mode is enabled.
+         $middlewares = [
+             new BasicAuthMiddleware(),
+-            new CacheMiddleware($this->container['cache']),
++            //new CacheMiddleware($this->container['cache']),
+             new ExceptionMiddleware($this->container['logger']),
+             new SecurityMiddleware(),
+             new MaintenanceMiddleware(),
+```
\ No newline at end of file
diff --git a/docs/04_For_Developers/index.md b/docs/04_For_Developers/index.md
index 97bbb854..31e513a5 100644
--- a/docs/04_For_Developers/index.md
+++ b/docs/04_For_Developers/index.md
@@ -6,7 +6,6 @@ If you are new to **RSS-Bridge** you should make yourself familiar with some gen
 
   - [Coding style policy](./01_Coding_style_policy.md)
   - [Folder structure](./03_Folder_structure.md)
-  - [Debug mode](./05_Debug_mode.md)
   - [Bridge API](../05_Bridge_API/index.md)
   - [Cache API](../07_Cache_API/index.md)
   - [Technical recommendations](../09_Technical_recommendations/index.md)
diff --git a/index.php b/index.php
index 02ea9a3d..79403e11 100644
--- a/index.php
+++ b/index.php
@@ -29,7 +29,7 @@ set_error_handler(function ($code, $message, $file, $line) use ($logger) {
         // Deprecation messages and other masked errors are typically ignored here
         return false;
     }
-    if (Debug::isEnabled()) {
+    if (Configuration::getConfig('system', 'env') === 'dev') {
         // This might be annoying, but it's for the greater good
         throw new \ErrorException($message, 0, $code, $file, $line);
     }
diff --git a/lib/Configuration.php b/lib/Configuration.php
index 37368894..d8f64d21 100644
--- a/lib/Configuration.php
+++ b/lib/Configuration.php
@@ -36,11 +36,10 @@ final class Configuration
         }
 
         if (file_exists(__DIR__ . '/../DEBUG')) {
-            // The debug mode has been moved to config. Preserve existing installs which has this DEBUG file.
-            self::setConfig('system', 'enable_debug_mode', true);
             $debug = trim(file_get_contents(__DIR__ . '/../DEBUG'));
-            if ($debug) {
-                self::setConfig('system', 'debug_mode_whitelist', explode("\n", str_replace("\r", '', $debug)));
+            if ($debug === '') {
+                self::setConfig('system', 'env', 'dev');
+                self::setConfig('cache', 'type', 'array');
             }
         }
 
@@ -82,8 +81,8 @@ final class Configuration
             }
         }
 
-        if (Debug::isEnabled()) {
-            self::setConfig('cache', 'type', 'array');
+        if (!in_array(self::getConfig('system', 'env'), ['dev', 'prod'])) {
+            self::throwConfigError('system', 'env', 'Must be dev or prod');
         }
 
         if (!is_array(self::getConfig('system', 'enabled_bridges'))) {
@@ -97,13 +96,6 @@ final class Configuration
             self::throwConfigError('system', 'timezone');
         }
 
-        if (!is_bool(self::getConfig('system', 'enable_debug_mode'))) {
-            self::throwConfigError('system', 'enable_debug_mode', 'Is not a valid Boolean');
-        }
-        if (!is_array(self::getConfig('system', 'debug_mode_whitelist') ?: [])) {
-            self::throwConfigError('system', 'debug_mode_whitelist', 'Is not a valid array');
-        }
-
         if (!is_string(self::getConfig('proxy', 'url'))) {
             self::throwConfigError('proxy', 'url', 'Is not a valid string');
         }
@@ -199,6 +191,8 @@ final class Configuration
 
     private static function throwConfigError($section, $key, $message = '')
     {
-        throw new \Exception("Config [$section] => [$key] is invalid. $message");
+        http_response_code(500);
+        print ("Config [$section] => [$key] is invalid. $message");
+        exit(1);
     }
 }
diff --git a/lib/Debug.php b/lib/Debug.php
deleted file mode 100644
index 630fd8ec..00000000
--- a/lib/Debug.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-class Debug
-{
-    /**
-     * Convenience function for Configuration::getConfig('system', 'enable_debug_mode')
-     */
-    public static function isEnabled(): bool
-    {
-        $ip = $_SERVER['REMOTE_ADDR'] ?? 'x.y.z.1';
-        $enableDebugMode = Configuration::getConfig('system', 'enable_debug_mode');
-        $debugModeWhitelist = Configuration::getConfig('system', 'debug_mode_whitelist') ?: [];
-        if ($enableDebugMode && ($debugModeWhitelist === [] || in_array($ip, $debugModeWhitelist))) {
-            return true;
-        }
-        return false;
-    }
-}
diff --git a/lib/dependencies.php b/lib/dependencies.php
index 45ae5d61..dfaa828b 100644
--- a/lib/dependencies.php
+++ b/lib/dependencies.php
@@ -47,16 +47,16 @@ $container['cache_factory'] = function ($c) {
 
 $container['logger'] = function () {
     $logger = new SimpleLogger('rssbridge');
-    if (Debug::isEnabled()) {
+    if (Configuration::getConfig('system', 'env') === 'dev') {
         $logger->addHandler(new ErrorLogHandler(Logger::DEBUG));
     } else {
         $logger->addHandler(new ErrorLogHandler(Logger::INFO));
     }
     // Uncomment this for info logging to fs
-    // $logger->addHandler(new StreamHandler('/tmp/rss-bridge.txt', Logger::INFO));
+    // $logger->addHandler(new StreamHandler('/tmp/rss-bridge.log', Logger::INFO));
 
     // Uncomment this for debug logging to fs
-    // $logger->addHandler(new StreamHandler('/tmp/rss-bridge-debug.txt', Logger::DEBUG));
+    // $logger->addHandler(new StreamHandler('/tmp/rss-bridge-debug.log', Logger::DEBUG));
     return $logger;
 };
 
diff --git a/lib/html.php b/lib/html.php
index 71a3a29e..dd756979 100644
--- a/lib/html.php
+++ b/lib/html.php
@@ -15,19 +15,15 @@ function render(string $template, array $context = []): string
             'level' => 'info',
         ];
     }
-    if (Debug::isEnabled()) {
-        $debugModeWhitelist = Configuration::getConfig('system', 'debug_mode_whitelist') ?: [];
-        if ($debugModeWhitelist === []) {
-            $context['messages'][] = [
-                'body' => 'Warning : Debug mode is active from any location, make sure only you can access RSS-Bridge.',
-                'level' => 'error'
-            ];
-        } else {
-            $context['messages'][] = [
-                'body' => 'Warning : Debug mode is active from your IP address, your requests will bypass the cache.',
-                'level' => 'warning'
-            ];
-        }
+    if (Configuration::getConfig('system', 'env') === 'dev') {
+        $context['messages'][] = [
+            'body' => 'System environment: dev',
+            'level' => 'error'
+        ];
+        $context['messages'][] = [
+            'body' => sprintf('Cache type: %s', Configuration::getConfig('cache', 'type')),
+            'level' => 'info'
+        ];
     }
     $context['page'] = render_template($template, $context);
     return render_template('base.html.php', $context);
diff --git a/lib/http.php b/lib/http.php
index b89e3c05..8f0a1638 100644
--- a/lib/http.php
+++ b/lib/http.php
@@ -23,12 +23,10 @@ class HttpException extends \Exception
     public static function fromResponse(Response $response, string $url): HttpException
     {
         $message = sprintf(
-            '%s resulted in %s %s %s',
+            '%s resulted in %s %s',
             $url,
             $response->getCode(),
-            $response->getStatusLine(),
-            // If debug, include a part of the response body in the exception message
-            Debug::isEnabled() ? mb_substr($response->getBody(), 0, 500) : '',
+            $response->getStatusLine()
         );
         if (CloudFlareException::isCloudFlareResponse($response)) {
             return new CloudFlareException($message, $response->getCode(), $response);