_, _ = g.Run(t, []test.TestCase{
     {
         Data:   request,
         Method: http.MethodPost,
         Headers: map[string]string{
-            "X-Tyk-Key":   "tyk-value",
-            "X-Other-Key": "other-value",
-            "X-Tyk-Test":  "value-from-consumer",
+            "x-tyk-key":   "tyk-value",
+            "x-other-key": "other-value",
+            "x-tyk-test":  "value-from-consumer",
         },
         Code:      http.StatusOK,
         BodyMatch: `{"data":{"hello":"World","httpMethod":"POST"}}`,
         HeadersMatch: map[string]string{
             "X-Tyk-Key":   "tyk-value",
             "X-Other-Key": "other-value",
             "X-Tyk-Test":  "value-from-rewrite-config",
         },
     },
 }...)