multipart

src/RequestBuilderTrait.php

@@ -57,11 +57,6 @@ public function getRequest(): RequestInterface
     {
         $this->beforeBuildRequest();
 
-        // Need to be removed, generated by Guzzle
-        if (isset($this->headers['Content-Type']) && 'multipart/form-data' === $this->headers['Content-Type']) {
-            unset($this->headers['Content-Type']);
-        }
-
         return new Request($this->method, $this->getUri(), $this->headers, $this->getBody());
     }
 
@@ -102,7 +97,7 @@ protected function getBody(): string|StreamInterface|null
     {
         $contentType = $this->headers['Content-Type'] ?? null;
 
-        if ($contentType === 'multipart/form-data') {
+        if (isset($this->bodyParams[0])) {
             return new MultipartStream($this->bodyParams);
         } else if ($contentType === 'application/json') {
             return $this->jsonEncode($this->bodyParams);