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index ad95e0f21..82dc857ff 100644
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             "require": {
@@ -9063,7 +9092,7 @@
             "description": "Allows you to standardize and centralize the way objects are constructed in your application",
             "homepage": "https://symfony.com",
             "support": {
-                "source": "https://github.com/symfony/dependency-injection/tree/v6.4.13"
+                "source": "https://github.com/symfony/dependency-injection/tree/v6.4.15"
             },
             "funding": [
                 {
@@ -9079,7 +9108,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-10-25T15:07:50+00:00"
+            "time": "2024-11-09T06:56:25+00:00"
         },
         {
             "name": "symfony/event-dispatcher",
@@ -9420,7 +9449,7 @@
     ],
     "aliases": [],
     "minimum-stability": "dev",
-    "stability-flags": [],
+    "stability-flags": {},
     "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
@@ -9429,7 +9458,7 @@
         "ext-gd": "*",
         "ext-mbstring": "*"
     },
-    "platform-dev": [],
+    "platform-dev": {},
     "platform-overrides": {
         "php": "8.1.27"
     },
diff --git a/docs/4-Configuration.md b/docs/4-Configuration.md
index ad22a761a..58b46ae2d 100644
--- a/docs/4-Configuration.md
+++ b/docs/4-Configuration.md
@@ -589,6 +589,50 @@ When `debug` is enabled, you can easily [dump a variable in your templates](3-Te
 {{ d(variable) }} # HTML dump
 ```
 
+### headers
+
+You can define custom HTTP headers used by the local preview server.
+
+It's useful to test custom Content Security or Cache Policy.
+
+```yaml
+headers:
+  - source: <path prefixed with a slash>
+    headers:
+      - key: <key>
+        value: "<value>"
+```
+
+_Example:_
+
+```yaml
+headers:
+  - source: /*
+    headers:
+      - key: X-Frame-Options
+        value: "SAMEORIGIN"
+      - key: X-XSS-Protection
+        value: "1; mode=block"
+      - key: X-Content-Type-Options
+        value: "nosniff"
+      - key: Content-Security-Policy
+        value: "default-src 'self'; object-src 'self'; img-src 'self'"
+      - key: Strict-Transport-Security
+        value: "max-age=31536000; includeSubDomains; preload"
+  - source: /images/*
+    headers:
+      - key: Cache-Control
+        value: "public, max-age=31536000"
+  - source: /assets/*
+    headers:
+      - key: Cache-Control
+        value: "public, max-age=31536000"
+  - source: /test.html
+    headers:
+      - key: Foo
+        value: "bar"
+```
+
 ## Default configuration
 
 Your site configuration (`config.yml`) overrides the following [default configuration](https://github.com/Cecilapp/Cecil/blob/master/config/default.php).
diff --git a/resources/server/router.php b/resources/server/router.php
index ef59d7238..a4c043218 100644
--- a/resources/server/router.php
+++ b/resources/server/router.php
@@ -126,15 +126,48 @@
     }
 }
 
-// returns result
+/**
+ * Returns result
+ */
+
+// local server headers
 header('Etag: ' . md5_file($filename));
 header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
 header('Cache-Control: post-check=0, pre-check=0', false);
 header('Pragma: no-cache');
 header('X-Powered-By: Cecil,PHP/' . phpversion());
+// file type headers
 foreach ($pathInfo['headers'] as $header) {
     header($header);
 }
+// custom headers based on path
+$headersFile = $_SERVER['DOCUMENT_ROOT'] . '/../' . SERVER_TMP_DIR . '/headers.ini';
+if (file_exists($headersFile)) {
+    $headersArray = parse_ini_file($headersFile, true);
+    // joker path tree
+    $pathParts = explode('/', pathinfo($path, PATHINFO_DIRNAME));
+    $previous = '';
+    for ($i = 0; $i < \count($pathParts); $i++) {
+        $headersSectionKey = $previous . \sprintf('/%s/*', trim($pathParts[$i], '\\'));
+        $previous .= '/' . $pathParts[$i];
+        $headersSectionKey = '/' . trim($headersSectionKey, '/');
+        if (\array_key_exists($headersSectionKey, $headersArray)) {
+            foreach ($headersArray[$headersSectionKey] as $key => $value) {
+                header("$key: " . $value);
+            }
+        }
+        if (empty($pathParts[1])) {
+            break;
+        }
+    }
+    // exact file path
+    if (\array_key_exists($path, $headersArray)) {
+        foreach ($headersArray[$path] as $key => $value) {
+            header("$key: " . $value);
+        }
+    }
+}
+// file content
 echo $content;
 
 return logger(true);
diff --git a/src/Command/Serve.php b/src/Command/Serve.php
index 5c12fef75..e25564572 100644
--- a/src/Command/Serve.php
+++ b/src/Command/Serve.php
@@ -147,7 +147,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
         $output->writeln(\sprintf('<comment>Build process: %s</comment>', implode(' ', $buildProcessArguments)), OutputInterface::VERBOSITY_DEBUG);
         $buildProcess->run($processOutputCallback);
         if ($buildProcess->isSuccessful()) {
-            Util\File::getFS()->dumpFile(Util::joinFile($this->getPath(), self::TMP_DIR, 'changes.flag'), time());
+            $this->buildSuccess($output);
         }
         if ($buildProcess->getExitCode() !== 0) {
             return 1;
@@ -219,7 +219,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
                         // re-builds
                         $buildProcess->run($processOutputCallback);
                         if ($buildProcess->isSuccessful()) {
-                            Util\File::getFS()->dumpFile(Util::joinFile($this->getPath(), self::TMP_DIR, 'changes.flag'), time());
+                            $this->buildSuccess($output);
                         }
 
                         $output->writeln('<info>Server is runnning...</info>');
@@ -238,6 +238,25 @@ protected function execute(InputInterface $input, OutputInterface $output)
         return 0;
     }
 
+    /**
+     * Build success.
+     */
+    private function buildSuccess(OutputInterface $output): void
+    {
+        // writes `changes.flag` file
+        Util\File::getFS()->dumpFile(Util::joinFile($this->getPath(), self::TMP_DIR, 'changes.flag'), time());
+        // writes `headers.ini` file
+        if (null !== $headers = $this->getBuilder()->getConfig()->get('headers')) {
+            $output->writeln('Writing headers file...');
+            foreach ($headers as $header) {
+                Util\File::getFS()->appendToFile(Util::joinFile($this->getPath(), self::TMP_DIR, 'headers.ini'), "[{$header['source']}]\n");
+                foreach ($header['headers'] as $h) {
+                    Util\File::getFS()->appendToFile(Util::joinFile($this->getPath(), self::TMP_DIR, 'headers.ini'), "{$h['key']} = \"{$h['value']}\"\n");
+                }
+            }
+        }
+    }
+
     /**
      * Prepares server's files.
      *