feat(Response): Add stream method to retrieve body as stream

- Implement new stream method in Response class
- Allow retrieval of the response body as a stream interface
- Ensure stream is seekable and rewound before return
- Enhance body handling for easier manipulation of response content

Author: guanguans

src/Foundation/Response.php

@@ -26,6 +26,7 @@
 use Illuminate\Support\Collection;
 use Psr\Http\Message\RequestInterface;
 use Psr\Http\Message\ResponseInterface;
+use Psr\Http\Message\StreamInterface;
 use Psr\Http\Message\UriInterface;
 
 /**
@@ -196,6 +197,28 @@ public function collect($key = null): Collection
         return Collection::make($this->json($key));
     }
 
+    /**
+     * Generate a data URL from the content type and body.
+     */
+    public function dataUrl(): string
+    {
+        return \sprintf('data:%s;base64,%s', $this->getHeaderLine('Content-Type'), base64_encode($this->body()));
+    }
+
+    /**
+     * Get the body as a stream.
+     */
+    public function stream(): StreamInterface
+    {
+        $stream = $this->getBody();
+
+        if ($stream->isSeekable()) {
+            $stream->rewind();
+        }
+
+        return $stream;
+    }
+
     /**
      * Get the body of the response as a PHP resource.
      *
@@ -208,14 +231,6 @@ public function resource()
         return StreamWrapper::getResource($this->getBody());
     }
 
-    /**
-     * Generate a data URL from the content type and body.
-     */
-    public function dataUrl(): string
-    {
-        return \sprintf('data:%s;base64,%s', $this->getHeaderLine('Content-Type'), base64_encode($this->body()));
-    }
-
     /**
      * Save the response to resource or file.
      *
@@ -235,11 +250,7 @@ public function saveAs($resourceOrPath, bool $closeResource = true): void
 
         rewind($resource);
 
-        $stream = $this->getBody();
-
-        if ($stream->isSeekable()) {
-            $stream->rewind();
-        }
+        $stream = $this->stream();
 
         while (!$stream->eof()) {
             fwrite($resource, $stream->read(1024));