diff --git a/package.json b/package.json
index ecccc71d..73c68bf1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@microsoft.azure/autorest.testserver",
-  "version": "3.0.19",
+  "version": "3.0.20",
   "description": "Autorest test server.",
   "main": "dist/cli/cli.js",
   "bin": {
diff --git a/swagger/storage.json b/swagger/storage.json
index ba836bf0..90c896be 100644
--- a/swagger/storage.json
+++ b/swagger/storage.json
@@ -235,6 +235,14 @@
         "responses": {
           "200": {
             "description": "",
+            "headers": {
+                "x-ms-meta": {
+                  "type": "string",
+                  "description": "adding x-ms-header-collection-prefix response header. Just checking if you can generate this without throwing for now",
+                  "x-ms-client-name": "Metadata",
+                  "x-ms-header-collection-prefix": "x-ms-meta-"
+                }
+            },
             "schema": {
               "$ref": "#/definitions/StorageAccountKeys"
             }
@@ -381,7 +389,7 @@
       },
       "required": [
         "name"
-      ]    
+      ]
     },
     "CheckNameAvailabilityResult": {
       "type":  "object",
@@ -798,4 +806,4 @@
       "x-ms-parameter-location": "method"
     }
   }
-}
\ No newline at end of file
+}