diff --git a/Neos.Flow/Classes/Mvc/ActionResponse.php b/Neos.Flow/Classes/Mvc/ActionResponse.php
index 8671eda844..32007f53e4 100644
--- a/Neos.Flow/Classes/Mvc/ActionResponse.php
+++ b/Neos.Flow/Classes/Mvc/ActionResponse.php
@@ -198,7 +198,9 @@ public function getHttpHeader(string $headerName)
     public function getContent(): string
     {
         $content = $this->content->getContents();
-        $this->content->rewind();
+        if ($this->content->isSeekable()) {
+            $this->content->rewind();
+        }
         return $content;
     }
 
diff --git a/Neos.Http.Factories/Classes/StreamFactoryTrait.php b/Neos.Http.Factories/Classes/StreamFactoryTrait.php
index 6c79adcc84..8ea6d2c98b 100644
--- a/Neos.Http.Factories/Classes/StreamFactoryTrait.php
+++ b/Neos.Http.Factories/Classes/StreamFactoryTrait.php
@@ -3,8 +3,8 @@
 
 namespace Neos\Http\Factories;
 
+use GuzzleHttp\Psr7\BufferStream;
 use GuzzleHttp\Psr7\Stream;
-use Psr\Http\Message\StreamFactoryInterface;
 use Psr\Http\Message\StreamInterface;
 
 /**
@@ -17,11 +17,9 @@ trait StreamFactoryTrait
      */
     public function createStream(string $content = ''): StreamInterface
     {
-        $fileHandle = fopen('php://temp', 'r+');
-        fwrite($fileHandle, $content);
-        rewind($fileHandle);
-
-        return $this->createStreamFromResource($fileHandle);
+        $stream = new BufferStream();
+        $stream->write($content);
+        return $stream;
     }
 
     /**