diff --git a/Connection.php b/Connection.php
index <HASH>..<HASH> 100644
--- a/Connection.php
+++ b/Connection.php
@@ -424,7 +424,10 @@ class Connection extends Component
             CURLOPT_RETURNTRANSFER => false,
             CURLOPT_HEADER         => false,
             // http://www.php.net/manual/en/function.curl-setopt.php#82418
-            CURLOPT_HTTPHEADER     => ['Expect:'],
+            CURLOPT_HTTPHEADER     => [
+                'Expect:',
+                'Content-Type: application/json',
+            ],
 
             CURLOPT_WRITEFUNCTION  => function ($curl, $data) use (&$body) {
                 $body .= $data;
<I> (#<I>)

* support "gt", ">", "lt", "<", "gte", ">=", "lte" and "<=" operator



* reset the curl post fields and post method when resetting the curl handler



* Remove deprecated warning "Content type detection for rest requests is deprecated. Specify the content type using the [Content-Type] header"