From 74c69749ec996bacf00e91c04890b6e90ac0b8fd Mon Sep 17 00:00:00 2001
From: ferhat elmas <elmas.ferhat@gmail.com>
Date: Wed, 21 Feb 2024 11:09:58 +0100
Subject: [PATCH] Make 520 status code retryable (#1935)

---
 retry.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/retry.go b/retry.go
index 1c6105e6a..5ddcad897 100644
--- a/retry.go
+++ b/retry.go
@@ -118,6 +118,7 @@ var retryableHTTPStatusCodes = map[int]struct{}{
 	http.StatusBadGateway:          {},
 	http.StatusServiceUnavailable:  {},
 	http.StatusGatewayTimeout:      {},
+	520:                            {}, // It is used by Cloudflare as a catch-all response for when the origin server sends something unexpected.
 	// Add more HTTP status codes here.
 }