diff --git a/docs/configuration.md b/docs/configuration.md
index 3f7cbf2a..69fd87fc 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -312,6 +312,9 @@ Enabled byd efault but can be disabled via the `sensiolabs_gotenberg.controller_
 
 ## download from
 
+> [!WARNING]  
+> URL of the file. It MUST return a `Content-Disposition` header with a filename parameter.
+
 To download files resource from URLs.
 
 ``` yaml
diff --git a/docs/pdf/builders_api/HtmlPdfBuilder.md b/docs/pdf/builders_api/HtmlPdfBuilder.md
index 4dc69023..f1b399b2 100644
--- a/docs/pdf/builders_api/HtmlPdfBuilder.md
+++ b/docs/pdf/builders_api/HtmlPdfBuilder.md
@@ -128,13 +128,13 @@ Resets the metadata.
 The metadata to write.
 
 * `downloadFrom(array $downloadFrom)`:
-Sets download from to download each entry (file) in parallel (default None).
-(URLs MUST return a Content-Disposition header with a filename parameter.).
 
 * `fileName(string $fileName, string $headerDisposition)`:
 
 * `processor(Sensiolabs\GotenbergBundle\Processor\ProcessorInterface $processor)`:
 
+* `withDownloadFrom(array $formFields, array $downloadFrom)`:
+
 * `addCookies(array $cookies)`:
 Add cookies to store in the Chromium cookie jar.
 
diff --git a/docs/pdf/builders_api/LibreOfficePdfBuilder.md b/docs/pdf/builders_api/LibreOfficePdfBuilder.md
index adab5a3f..eeee4b63 100644
--- a/docs/pdf/builders_api/LibreOfficePdfBuilder.md
+++ b/docs/pdf/builders_api/LibreOfficePdfBuilder.md
@@ -86,10 +86,10 @@ Specify if the resolution of each image is reduced to the resolution specified b
 If the form field reduceImageResolution is set to true, tell if all images will be reduced to the given value in DPI. Possible values are: 75, 150, 300, 600 and 1200.
 
 * `downloadFrom(array $downloadFrom)`:
-Sets download from to download each entry (file) in parallel (default None).
-(URLs MUST return a Content-Disposition header with a filename parameter.).
 
 * `fileName(string $fileName, string $headerDisposition)`:
 
 * `processor(Sensiolabs\GotenbergBundle\Processor\ProcessorInterface $processor)`:
 
+* `withDownloadFrom(array $formFields, array $downloadFrom)`:
+
diff --git a/docs/pdf/builders_api/MarkdownPdfBuilder.md b/docs/pdf/builders_api/MarkdownPdfBuilder.md
index 406f5e28..9dd36ef1 100644
--- a/docs/pdf/builders_api/MarkdownPdfBuilder.md
+++ b/docs/pdf/builders_api/MarkdownPdfBuilder.md
@@ -131,13 +131,13 @@ Resets the metadata.
 The metadata to write.
 
 * `downloadFrom(array $downloadFrom)`:
-Sets download from to download each entry (file) in parallel (default None).
-(URLs MUST return a Content-Disposition header with a filename parameter.).
 
 * `fileName(string $fileName, string $headerDisposition)`:
 
 * `processor(Sensiolabs\GotenbergBundle\Processor\ProcessorInterface $processor)`:
 
+* `withDownloadFrom(array $formFields, array $downloadFrom)`:
+
 * `addCookies(array $cookies)`:
 Add cookies to store in the Chromium cookie jar.
 
diff --git a/docs/pdf/builders_api/UrlPdfBuilder.md b/docs/pdf/builders_api/UrlPdfBuilder.md
index 528dc172..555583c1 100644
--- a/docs/pdf/builders_api/UrlPdfBuilder.md
+++ b/docs/pdf/builders_api/UrlPdfBuilder.md
@@ -130,13 +130,13 @@ Resets the metadata.
 The metadata to write.
 
 * `downloadFrom(array $downloadFrom)`:
-Sets download from to download each entry (file) in parallel (default None).
-(URLs MUST return a Content-Disposition header with a filename parameter.).
 
 * `fileName(string $fileName, string $headerDisposition)`:
 
 * `processor(Sensiolabs\GotenbergBundle\Processor\ProcessorInterface $processor)`:
 
+* `withDownloadFrom(array $formFields, array $downloadFrom)`:
+
 * `addCookies(array $cookies)`:
 Add cookies to store in the Chromium cookie jar.
 
diff --git a/docs/pdf/customization.md b/docs/pdf/customization.md
index fc86dd65..94eb193a 100644
--- a/docs/pdf/customization.md
+++ b/docs/pdf/customization.md
@@ -529,6 +529,9 @@ class YourController
 
 ### download from
 
+> [!WARNING]  
+> URL of the file. It MUST return a `Content-Disposition` header with a filename parameter.
+
 To download files resource from URLs.
 
 ```php
diff --git a/docs/pdf/office-builder.md b/docs/pdf/office-builder.md
index 4e098bf3..0b8fe11c 100644
--- a/docs/pdf/office-builder.md
+++ b/docs/pdf/office-builder.md
@@ -773,6 +773,9 @@ class YourController
 
 ### download from
 
+> [!WARNING]  
+> URL of the file. It MUST return a `Content-Disposition` header with a filename parameter.
+
 To download files resource from URLs.
 
 ```php
diff --git a/docs/screenshot/builders_api/HtmlScreenshotBuilder.md b/docs/screenshot/builders_api/HtmlScreenshotBuilder.md
index 551adff1..35c73f68 100644
--- a/docs/screenshot/builders_api/HtmlScreenshotBuilder.md
+++ b/docs/screenshot/builders_api/HtmlScreenshotBuilder.md
@@ -73,13 +73,13 @@ Adds additional files, like images, fonts, stylesheets, and so on (overrides any
 Adds a file, like an image, font, stylesheet, and so on.
 
 * `downloadFrom(array $downloadFrom)`:
-Sets download from to download each entry (file) in parallel (default None).
-(URLs MUST return a Content-Disposition header with a filename parameter.).
 
 * `fileName(string $fileName, string $headerDisposition)`:
 
 * `processor(Sensiolabs\GotenbergBundle\Processor\ProcessorInterface $processor)`:
 
+* `withDownloadFrom(array $formFields, array $downloadFrom)`:
+
 * `addCookies(array $cookies)`:
 Add cookies to store in the Chromium cookie jar.
 
diff --git a/docs/screenshot/builders_api/MarkdownScreenshotBuilder.md b/docs/screenshot/builders_api/MarkdownScreenshotBuilder.md
index ccd2872a..1dec2ca6 100644
--- a/docs/screenshot/builders_api/MarkdownScreenshotBuilder.md
+++ b/docs/screenshot/builders_api/MarkdownScreenshotBuilder.md
@@ -76,13 +76,13 @@ Adds additional files, like images, fonts, stylesheets, and so on (overrides any
 Adds a file, like an image, font, stylesheet, and so on.
 
 * `downloadFrom(array $downloadFrom)`:
-Sets download from to download each entry (file) in parallel (default None).
-(URLs MUST return a Content-Disposition header with a filename parameter.).
 
 * `fileName(string $fileName, string $headerDisposition)`:
 
 * `processor(Sensiolabs\GotenbergBundle\Processor\ProcessorInterface $processor)`:
 
+* `withDownloadFrom(array $formFields, array $downloadFrom)`:
+
 * `addCookies(array $cookies)`:
 Add cookies to store in the Chromium cookie jar.
 
diff --git a/docs/screenshot/builders_api/UrlScreenshotBuilder.md b/docs/screenshot/builders_api/UrlScreenshotBuilder.md
index 8fbd868e..5ac3c857 100644
--- a/docs/screenshot/builders_api/UrlScreenshotBuilder.md
+++ b/docs/screenshot/builders_api/UrlScreenshotBuilder.md
@@ -75,13 +75,13 @@ Adds additional files, like images, fonts, stylesheets, and so on (overrides any
 Adds a file, like an image, font, stylesheet, and so on.
 
 * `downloadFrom(array $downloadFrom)`:
-Sets download from to download each entry (file) in parallel (default None).
-(URLs MUST return a Content-Disposition header with a filename parameter.).
 
 * `fileName(string $fileName, string $headerDisposition)`:
 
 * `processor(Sensiolabs\GotenbergBundle\Processor\ProcessorInterface $processor)`:
 
+* `withDownloadFrom(array $formFields, array $downloadFrom)`:
+
 * `addCookies(array $cookies)`:
 Add cookies to store in the Chromium cookie jar.
 
diff --git a/docs/screenshot/customization.md b/docs/screenshot/customization.md
index 775bdcc7..f4610162 100644
--- a/docs/screenshot/customization.md
+++ b/docs/screenshot/customization.md
@@ -189,6 +189,9 @@ class YourController
 
 ### download from
 
+> [!WARNING]  
+> URL of the file. It MUST return a `Content-Disposition` header with a filename parameter.
+
 To download files resource from URLs.
 
 ```php
diff --git a/src/Builder/DownloadFromTrait.php b/src/Builder/DownloadFromTrait.php
new file mode 100644
index 00000000..e1925881
--- /dev/null
+++ b/src/Builder/DownloadFromTrait.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Sensiolabs\GotenbergBundle\Builder;
+
+use Sensiolabs\GotenbergBundle\Exception\MissingRequiredFieldException;
+
+trait DownloadFromTrait
+{
+    /**
+     * Sets download from to download each entry (file) in parallel (default None).
+     * (URLs MUST return a Content-Disposition header with a filename parameter.).
+     *
+     * @see https://gotenberg.dev/docs/routes#download-from
+     *
+     * @param list<array{url: string, extraHttpHeaders?: array<string, string>}> $downloadFrom
+     */
+    abstract public function downloadFrom(array $downloadFrom): static;
+
+    /**
+     * @param array{downloadFrom?: array<string, array{url: string, extraHttpHeaders?: array<string, string>}>} $formFields
+     * @param list<array{url: string, extraHttpHeaders?: array<string, string>}>                                $downloadFrom
+     */
+    public function withDownloadFrom(array &$formFields, array $downloadFrom): static
+    {
+        if ([] === $downloadFrom) {
+            unset($formFields['downloadFrom']);
+
+            return $this;
+        }
+
+        $formFields['downloadFrom'] = [];
+
+        foreach ($downloadFrom as $file) {
+            if (!\array_key_exists('url', $file)) {
+                throw new MissingRequiredFieldException('Missing field "url"');
+            }
+
+            $formFields['downloadFrom'][$file['url']] = $file;
+        }
+
+        return $this;
+    }
+
+    private function downloadFromNormalizer(array $value, callable $encoder): array
+    {
+        $downloadsFrom = array_values($value);
+        $data = [];
+
+        array_push($data, ...$downloadsFrom);
+
+        return $encoder('downloadFrom', $data);
+    }
+}
diff --git a/src/Builder/Pdf/AbstractChromiumPdfBuilder.php b/src/Builder/Pdf/AbstractChromiumPdfBuilder.php
index 3626253a..d5f2cd34 100644
--- a/src/Builder/Pdf/AbstractChromiumPdfBuilder.php
+++ b/src/Builder/Pdf/AbstractChromiumPdfBuilder.php
@@ -522,31 +522,6 @@ public function addMetadata(string $key, string $value): static
         return $this;
     }
 
-    /**
-     * Sets download from to download each entry (file) in parallel (default None).
-     * (URLs MUST return a Content-Disposition header with a filename parameter.).
-     *
-     * @see https://gotenberg.dev/docs/routes#download-from
-     *
-     * @param list<array{url: string, extraHttpHeaders: array<string, string>}> $downloadFrom
-     */
-    public function downloadFrom(array $downloadFrom): static
-    {
-        if ([] === $downloadFrom) {
-            unset($this->formFields['downloadFrom']);
-
-            return $this;
-        }
-
-        $this->formFields['downloadFrom'] = [];
-
-        foreach ($downloadFrom as $file) {
-            $this->formFields['downloadFrom'][] = $file;
-        }
-
-        return $this;
-    }
-
     protected function withPdfPartFile(Part $pdfPart, string $path): static
     {
         $dataPart = new DataPart(
diff --git a/src/Builder/Pdf/AbstractPdfBuilder.php b/src/Builder/Pdf/AbstractPdfBuilder.php
index b7931801..658cab32 100644
--- a/src/Builder/Pdf/AbstractPdfBuilder.php
+++ b/src/Builder/Pdf/AbstractPdfBuilder.php
@@ -3,12 +3,14 @@
 namespace Sensiolabs\GotenbergBundle\Builder\Pdf;
 
 use Sensiolabs\GotenbergBundle\Builder\DefaultBuilderTrait;
+use Sensiolabs\GotenbergBundle\Builder\DownloadFromTrait;
 use Sensiolabs\GotenbergBundle\Client\GotenbergClientInterface;
 use Sensiolabs\GotenbergBundle\Formatter\AssetBaseDirFormatter;
 
 abstract class AbstractPdfBuilder implements PdfBuilderInterface
 {
     use DefaultBuilderTrait;
+    use DownloadFromTrait;
 
     public function __construct(
         GotenbergClientInterface $gotenbergClient,
@@ -21,9 +23,15 @@ public function __construct(
             'metadata' => function (mixed $value): array {
                 return $this->encodeData('metadata', $value);
             },
-            'downloadFrom' => function (mixed $value): array {
-                return $this->encodeData('downloadFrom', $value);
-            },
+            'downloadFrom' => fn (array $value): array => $this->downloadFromNormalizer($value, $this->encodeData(...)),
         ];
     }
+
+    /**
+     * @param list<array{url: string, extraHttpHeaders: array<string, string>}> $downloadFrom
+     */
+    public function downloadFrom(array $downloadFrom): static
+    {
+        return $this->withDownloadFrom($this->formFields, $downloadFrom);
+    }
 }
diff --git a/src/Builder/Pdf/ConvertPdfBuilder.php b/src/Builder/Pdf/ConvertPdfBuilder.php
index 715ce4bd..33916fa1 100644
--- a/src/Builder/Pdf/ConvertPdfBuilder.php
+++ b/src/Builder/Pdf/ConvertPdfBuilder.php
@@ -74,31 +74,6 @@ public function getMultipartFormData(): array
         return parent::getMultipartFormData();
     }
 
-    /**
-     * Sets download from to download each entry (file) in parallel (default None).
-     * (URLs MUST return a Content-Disposition header with a filename parameter.).
-     *
-     * @see https://gotenberg.dev/docs/routes#download-from
-     *
-     * @param list<array{url: string, extraHttpHeaders: array<string, string>}> $downloadFrom
-     */
-    public function downloadFrom(array $downloadFrom): static
-    {
-        if ([] === $downloadFrom) {
-            unset($this->formFields['downloadFrom']);
-
-            return $this;
-        }
-
-        $this->formFields['downloadFrom'] = [];
-
-        foreach ($downloadFrom as $file) {
-            $this->formFields['downloadFrom'][] = $file;
-        }
-
-        return $this;
-    }
-
     protected function getEndpoint(): string
     {
         return self::ENDPOINT;
diff --git a/src/Builder/Pdf/LibreOfficePdfBuilder.php b/src/Builder/Pdf/LibreOfficePdfBuilder.php
index 0f76c4ea..38272193 100644
--- a/src/Builder/Pdf/LibreOfficePdfBuilder.php
+++ b/src/Builder/Pdf/LibreOfficePdfBuilder.php
@@ -43,7 +43,7 @@ public function setConfigurations(array $configurations): static
     /**
      * Set the password for opening the source file.
      */
-    public function password(string $password): self
+    public function password(#[\SensitiveParameter] string $password): self
     {
         $this->formFields['password'] = $password;
 
@@ -347,31 +347,6 @@ public function getMultipartFormData(): array
         return parent::getMultipartFormData();
     }
 
-    /**
-     * Sets download from to download each entry (file) in parallel (default None).
-     * (URLs MUST return a Content-Disposition header with a filename parameter.).
-     *
-     * @see https://gotenberg.dev/docs/routes#download-from
-     *
-     * @param list<array{url: string, extraHttpHeaders: array<string, string>}> $downloadFrom
-     */
-    public function downloadFrom(array $downloadFrom): self
-    {
-        if ([] === $downloadFrom) {
-            unset($this->formFields['downloadFrom']);
-
-            return $this;
-        }
-
-        $this->formFields['downloadFrom'] = [];
-
-        foreach ($downloadFrom as $file) {
-            $this->formFields['downloadFrom'][] = $file;
-        }
-
-        return $this;
-    }
-
     protected function getEndpoint(): string
     {
         return self::ENDPOINT;
diff --git a/src/Builder/Pdf/MergePdfBuilder.php b/src/Builder/Pdf/MergePdfBuilder.php
index fd6f5313..6ff9b8b5 100644
--- a/src/Builder/Pdf/MergePdfBuilder.php
+++ b/src/Builder/Pdf/MergePdfBuilder.php
@@ -96,31 +96,6 @@ public function getMultipartFormData(): array
         return parent::getMultipartFormData();
     }
 
-    /**
-     * Sets download from to download each entry (file) in parallel (default None).
-     * (URLs MUST return a Content-Disposition header with a filename parameter.).
-     *
-     * @see https://gotenberg.dev/docs/routes#download-from
-     *
-     * @param list<array{url: string, extraHttpHeaders: array<string, string>}> $downloadFrom
-     */
-    public function downloadFrom(array $downloadFrom): static
-    {
-        if ([] === $downloadFrom) {
-            unset($this->formFields['downloadFrom']);
-
-            return $this;
-        }
-
-        $this->formFields['downloadFrom'] = [];
-
-        foreach ($downloadFrom as $file) {
-            $this->formFields['downloadFrom'][] = $file;
-        }
-
-        return $this;
-    }
-
     protected function getEndpoint(): string
     {
         return self::ENDPOINT;
diff --git a/src/Builder/Screenshot/AbstractChromiumScreenshotBuilder.php b/src/Builder/Screenshot/AbstractChromiumScreenshotBuilder.php
index 3e39bcde..b41ba859 100644
--- a/src/Builder/Screenshot/AbstractChromiumScreenshotBuilder.php
+++ b/src/Builder/Screenshot/AbstractChromiumScreenshotBuilder.php
@@ -329,31 +329,6 @@ public function addAsset(string $path): static
         return $this;
     }
 
-    /**
-     * Sets download from to download each entry (file) in parallel (default None).
-     * (URLs MUST return a Content-Disposition header with a filename parameter.).
-     *
-     * @see https://gotenberg.dev/docs/routes#download-from
-     *
-     * @param list<array{url: string, extraHttpHeaders: array<string, string>}> $downloadFrom
-     */
-    public function downloadFrom(array $downloadFrom): static
-    {
-        if ([] === $downloadFrom) {
-            unset($this->formFields['downloadFrom']);
-
-            return $this;
-        }
-
-        $this->formFields['downloadFrom'] = [];
-
-        foreach ($downloadFrom as $file) {
-            $this->formFields['downloadFrom'][] = $file;
-        }
-
-        return $this;
-    }
-
     protected function withScreenshotPartFile(Part $screenshotPart, string $path): static
     {
         $dataPart = new DataPart(
diff --git a/src/Builder/Screenshot/AbstractScreenshotBuilder.php b/src/Builder/Screenshot/AbstractScreenshotBuilder.php
index 6f8e9efe..322719f0 100644
--- a/src/Builder/Screenshot/AbstractScreenshotBuilder.php
+++ b/src/Builder/Screenshot/AbstractScreenshotBuilder.php
@@ -3,6 +3,7 @@
 namespace Sensiolabs\GotenbergBundle\Builder\Screenshot;
 
 use Sensiolabs\GotenbergBundle\Builder\DefaultBuilderTrait;
+use Sensiolabs\GotenbergBundle\Builder\DownloadFromTrait;
 use Sensiolabs\GotenbergBundle\Client\GotenbergClientInterface;
 use Sensiolabs\GotenbergBundle\Enumeration\Part;
 use Sensiolabs\GotenbergBundle\Formatter\AssetBaseDirFormatter;
@@ -11,6 +12,7 @@
 abstract class AbstractScreenshotBuilder implements ScreenshotBuilderInterface
 {
     use DefaultBuilderTrait;
+    use DownloadFromTrait;
 
     public function __construct(
         GotenbergClientInterface $gotenbergClient,
@@ -20,24 +22,15 @@ public function __construct(
         $this->asset = $asset;
 
         $this->normalizers = [
-            'extraHttpHeaders' => function (mixed $value): array {
-                return $this->encodeData('extraHttpHeaders', $value);
-            },
-            'assets' => static function (array $value): array {
-                return ['files' => $value];
-            },
-            Part::Body->value => static function (DataPart $value): array {
-                return ['files' => $value];
-            },
-            'failOnHttpStatusCodes' => function (mixed $value): array {
-                return $this->encodeData('failOnHttpStatusCodes', $value);
-            },
-            'cookies' => function (mixed $value): array {
-                return $this->encodeData('cookies', array_values($value));
-            },
-            'downloadFrom' => function (mixed $value): array {
-                return $this->encodeData('downloadFrom', $value);
-            },
+            'downloadFrom' => fn (array $value): array => $this->downloadFromNormalizer($value, $this->encodeData(...)),
         ];
     }
+
+    /**
+     * @param list<array{url: string, extraHttpHeaders: array<string, string>}> $downloadFrom
+     */
+    public function downloadFrom(array $downloadFrom): static
+    {
+        return $this->withDownloadFrom($this->formFields, $downloadFrom);
+    }
 }
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 59dce55f..32c5c3a9 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -259,7 +259,7 @@ private function addChromiumPdfOptionsNode(ArrayNodeDefinition $parent): void
                     ->info('The JavaScript expression to wait before converting an HTML document into PDF until it returns true - default None. https://gotenberg.dev/docs/routes#wait-before-rendering')
                     ->defaultNull()
                     ->validate()
-                        ->ifTrue(static function ($option) {
+                        ->ifTrue(static function ($option): bool {
                             return !\is_string($option);
                         })
                         ->thenInvalid('Invalid value %s')
@@ -299,7 +299,7 @@ private function addChromiumPdfOptionsNode(ArrayNodeDefinition $parent): void
                     ->info('Override the default User-Agent HTTP header. - default None. https://gotenberg.dev/docs/routes#custom-http-headers-chromium')
                     ->defaultNull()
                     ->validate()
-                        ->ifTrue(static function ($option) {
+                        ->ifTrue(static function ($option): bool {
                             return !\is_string($option);
                         })
                         ->thenInvalid('Invalid value %s')
@@ -324,7 +324,7 @@ private function addChromiumPdfOptionsNode(ArrayNodeDefinition $parent): void
                 ->append($this->addDownloadFrom())
             ->end()
             ->validate()
-                ->ifTrue(function ($v) {
+                ->ifTrue(function ($v): bool {
                     return isset($v['paper_standard_size']) && (isset($v['paper_height']) || isset($v['paper_width']));
                 })
                 ->thenInvalid('You cannot use "paper_standard_size" when "paper_height", "paper_width" or both are set".')
@@ -383,7 +383,7 @@ private function addChromiumScreenshotOptionsNode(ArrayNodeDefinition $parent):
                     ->info('The JavaScript expression to wait before converting an HTML document into PDF until it returns true - default None. https://gotenberg.dev/docs/routes#wait-before-rendering')
                     ->defaultNull()
                     ->validate()
-                        ->ifTrue(static function ($option) {
+                        ->ifTrue(static function ($option): bool {
                             return !\is_string($option);
                         })
                         ->thenInvalid('Invalid value %s')
@@ -423,7 +423,7 @@ private function addChromiumScreenshotOptionsNode(ArrayNodeDefinition $parent):
                     ->info('Override the default User-Agent HTTP header. - default None. https://gotenberg.dev/docs/routes#custom-http-headers-chromium')
                     ->defaultNull()
                     ->validate()
-                        ->ifTrue(static function ($option) {
+                        ->ifTrue(static function ($option): bool {
                             return !\is_string($option);
                         })
                         ->thenInvalid('Invalid value %s')
@@ -647,7 +647,7 @@ private function addDownloadFrom(): NodeDefinition
                             ->children()
                                  ->scalarNode('name')
                                     ->validate()
-                                        ->ifTrue(static function ($option) {
+                                        ->ifTrue(static function ($option): bool {
                                             return !\is_string($option);
                                         })
                                         ->thenInvalid('Invalid header name %s')
@@ -655,7 +655,7 @@ private function addDownloadFrom(): NodeDefinition
                                 ->end()
                                 ->scalarNode('value')
                                     ->validate()
-                                        ->ifTrue(static function ($option) {
+                                        ->ifTrue(static function ($option): bool {
                                             return !\is_string($option);
                                         })
                                         ->thenInvalid('Invalid header value %s')
@@ -681,7 +681,7 @@ private function addExtraHttpHeaders(): NodeDefinition
                 ->children()
                     ->scalarNode('name')
                         ->validate()
-                            ->ifTrue(static function ($option) {
+                            ->ifTrue(static function ($option): bool {
                                 return !\is_string($option);
                             })
                             ->thenInvalid('Invalid header name %s')
@@ -689,7 +689,7 @@ private function addExtraHttpHeaders(): NodeDefinition
                     ->end()
                     ->scalarNode('value')
                         ->validate()
-                            ->ifTrue(static function ($option) {
+                            ->ifTrue(static function ($option): bool {
                                 return !\is_string($option);
                             })
                             ->thenInvalid('Invalid header value %s')