diff --git a/app/assets/javascripts/discourse/lib/bootstrap-json/index.js b/app/assets/javascripts/discourse/lib/bootstrap-json/index.js
index 1685d5328ec..ece7a60629d 100644
--- a/app/assets/javascripts/discourse/lib/bootstrap-json/index.js
+++ b/app/assets/javascripts/discourse/lib/bootstrap-json/index.js
@@ -240,6 +240,7 @@ async function handleRequest(proxy, baseURL, req, res) {
     308,
     404,
     403,
+    422,
     500,
   ];
   const proxyRequest = bent(req.method, acceptedStatusCodes);