From d257b9be96250b71ac02ffcf2116650d568c7b31 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niklas=20Hamb=C3=BCchen?= <mail@nh2.me>
Date: Fri, 14 Apr 2023 10:58:52 +0200
Subject: [PATCH] Fix HEAD not being retried for HTTP 500 category responses.
 See #579

---
 lib/upload.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/upload.js b/lib/upload.js
index 83dfa35b..c3857850 100644
--- a/lib/upload.js
+++ b/lib/upload.js
@@ -615,6 +615,11 @@ class BaseUpload {
         if (status === 423) {
           this._emitHttpError(req, res, 'tus: upload is currently locked; retry later')
           return
+        } else if (inStatusCategory(status, 500)) {
+          // Run retry logic if the server has an error, e.g. 502 Bad Gateway when
+          // proxied server is temporarily down. See issue #579.
+          this._emitHttpError(req, res, 'tus: resuming upload resulted in HTTP 500 category error')
+          return
         }
 
         if (inStatusCategory(status, 400)) {