diff --git a/src/Bigcommerce/Api/Connection.php b/src/Bigcommerce/Api/Connection.php
index 8885434f..1e5f7fd1 100644
--- a/src/Bigcommerce/Api/Connection.php
+++ b/src/Bigcommerce/Api/Connection.php
@@ -556,6 +556,12 @@ public function getHeader($header)
         if (array_key_exists($header, $this->responseHeaders)) {
             return $this->responseHeaders[$header];
         }
+        // Do case-insensitive search
+        foreach ($this->responseHeaders as $k => $v) {
+            if (strtolower($k) == strtolower($header)) {
+                return $v;
+            }
+        }
     }
 
     /**