From e4c0dd5669ad87638c1fe08c4e8347e4197ff19a Mon Sep 17 00:00:00 2001
From: Graham Campbell <hello@gjcampbell.co.uk>
Date: Wed, 27 May 2026 14:29:07 +0100
Subject: [PATCH] Preserve empty HTTP attach contents

---
 src/Illuminate/Http/Client/PendingRequest.php | 11 +++++--
 tests/Http/HttpClientTest.php                 | 29 +++++++++++++++++++
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/src/Illuminate/Http/Client/PendingRequest.php b/src/Illuminate/Http/Client/PendingRequest.php
index f850495c9873..6ee9587fac4e 100644
--- a/src/Illuminate/Http/Client/PendingRequest.php
+++ b/src/Illuminate/Http/Client/PendingRequest.php
@@ -351,12 +351,17 @@ public function attach($name, $contents = '', $filename = null, array $headers =
 
         $this->asMultipart();
 
-        $this->pendingFiles[] = array_filter([
+        $file = [
             'name' => $name,
             'contents' => $contents,
             'headers' => $headers,
-            'filename' => $filename,
-        ]);
+        ];
+
+        if ($filename !== null) {
+            $file['filename'] = $filename;
+        }
+
+        $this->pendingFiles[] = $file;
 
         return $this;
     }
diff --git a/tests/Http/HttpClientTest.php b/tests/Http/HttpClientTest.php
index 6e5040d77a43..0d0e339bfb31 100644
--- a/tests/Http/HttpClientTest.php
+++ b/tests/Http/HttpClientTest.php
@@ -795,6 +795,35 @@ public function testFilesCanBeAttached()
         });
     }
 
+    public function testAttachPreservesEmptyContents()
+    {
+        $this->factory->fake();
+
+        $this->factory->attach('file')->post('http://foo.com/file');
+
+        $this->factory->assertSent(function (Request $request) {
+            return $request->url() === 'http://foo.com/file'
+                && $request->isMultipart()
+                && $request[0]['name'] === 'file'
+                && array_key_exists('contents', $request[0])
+                && $request[0]['contents'] === '';
+        });
+    }
+
+    public function testAttachPreservesFalseyStringContentsAndName()
+    {
+        $this->factory->fake();
+
+        $this->factory->attach('0', '0')->post('http://foo.com/file');
+
+        $this->factory->assertSent(function (Request $request) {
+            return $request->url() === 'http://foo.com/file'
+                && $request->isMultipart()
+                && $request[0]['name'] === '0'
+                && $request[0]['contents'] === '0';
+        });
+    }
+
     public function testCanSendMultipartDataWithSimplifiedParameters()
     {
         $this->factory->fake();