fix: add filename parameters to inline Content-Disposition headers

system/HTTP/DownloadResponse.php

@@ -182,22 +182,21 @@ private function getDownloadFileName(): string
     }
 
     /**
-     * get Content-Disposition Header string.
+     * Get Content-Disposition Header string.
      */
-    private function getContentDisposition(): string
+    private function getContentDisposition(bool $inline = false): string
     {
-        $downloadFilename = $this->getDownloadFileName();
-
-        $utf8Filename = $downloadFilename;
+        $downloadFilename = $utf8Filename = $this->getDownloadFileName();
+        $disposition      = $inline ? 'inline' : 'attachment';
 
         if (strtoupper($this->charset) !== 'UTF-8') {
             $utf8Filename = mb_convert_encoding($downloadFilename, 'UTF-8', $this->charset);
         }
 
-        $result = sprintf('attachment; filename="%s"', $downloadFilename);
+        $result = sprintf('%s; filename="%s"', $disposition, addslashes($downloadFilename));
 
         if ($utf8Filename !== '') {
-            $result .= '; filename*=UTF-8\'\'' . rawurlencode($utf8Filename);
+            $result .= sprintf('; filename*=UTF-8\'\'%s', rawurlencode($utf8Filename));
         }
 
         return $result;
@@ -341,7 +340,7 @@ private function sendBodyByBinary()
      */
     public function inline()
     {
-        $this->setHeader('Content-Disposition', 'inline');
+        $this->setHeader('Content-Disposition', $this->getContentDisposition(true));
 
         return $this;
     }

tests/system/HTTP/DownloadResponseTest.php

@@ -136,7 +136,16 @@ public function testDispositionInline(): void
         $response = new DownloadResponse('unit-test.txt', true);
         $response->inline();
         $response->buildHeaders();
-        $this->assertSame('inline', $response->getHeaderLine('Content-Disposition'));
+        $this->assertSame('inline; filename="unit-test.txt"; filename*=UTF-8\'\'unit-test.txt', $response->getHeaderLine('Content-Disposition'));
+    }
+
+    public function testDispositionInlineWithSetFileName(): void
+    {
+        $response = new DownloadResponse('unit-test.txt', true);
+        $response->setFileName('my"quoted"File.txt');
+        $response->inline();
+        $response->buildHeaders();
+        $this->assertSame('inline; filename="my\"quoted\"File.txt"; filename*=UTF-8\'\'my%22quoted%22File.txt', $response->getHeaderLine('Content-Disposition'));
     }
 
     public function testNoCache(): void

user_guide_src/source/changelogs/v4.6.2.rst

@@ -42,6 +42,7 @@ Bugs Fixed
 - **CURLRequest:** Fixed a bug where intermediate HTTP responses were not properly removed from the response chain in certain scenarios, causing incorrect status codes and headers to be returned instead of the final response.
 - **Database:** Fixed a bug where ``when()`` and ``whenNot()`` in ``ConditionalTrait`` incorrectly evaluated certain falsy values (such as ``[]``, ``0``, ``0.0``, and ``'0'``) as truthy, causing callbacks to be executed unexpectedly. These methods now cast the condition to a boolean using ``(bool)`` to ensure consistent behavior with PHP's native truthiness.
 - **Database:** Fixed encapsulation violation in ``BasePreparedQuery`` when accessing ``BaseConnection::transStatus`` protected property.
+- **DownloadResponse:** Fixed a bug where ``filename`` parameters were missing from ``Content-Disposition`` headers when using inline disposition, causing browsers to use the last URL segment for filenames instead of the intended filename.
 - **Email:** Fixed a bug where ``Email::getHostname()`` failed to use ``$_SERVER['SERVER_ADDR']`` when ``$_SERVER['SERVER_NAME']`` was not set.
 - **Security:** Fixed a bug where the ``sanitize_filename()`` function from the Security helper would throw an error when used in CLI requests.
 - **Session:** Fixed a bug where using the ``DatabaseHandler`` with an unsupported database driver (such as ``SQLSRV``, ``OCI8``, or ``SQLite3``) did not throw an appropriate error.