From b95895cecfdc350b8af53247a7a60b1604734fcb Mon Sep 17 00:00:00 2001
From: Huang Xin <chrox.huang@gmail.com>
Date: Wed, 10 Dec 2025 16:57:44 +0800
Subject: [PATCH] compat(opds): fallback to Basic auth if no WWW-Authenticate
 challenge in the response headers, closes #2656 (#2673)

---
 apps/readest-app/src/app/opds/utils/opdsReq.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/apps/readest-app/src/app/opds/utils/opdsReq.ts b/apps/readest-app/src/app/opds/utils/opdsReq.ts
index e879204a..396a0294 100644
--- a/apps/readest-app/src/app/opds/utils/opdsReq.ts
+++ b/apps/readest-app/src/app/opds/utils/opdsReq.ts
@@ -210,6 +210,10 @@ export const probeAuth = async (
       } else if (wwwAuthenticate.toLowerCase().startsWith('basic')) {
         return createBasicAuth(finalUsername, finalPassword);
       }
+    } else {
+      // Fallback to Basic auth if no WWW-Authenticate header
+      // some older Calibre-Web versions behave this way, see issue #2656
+      return createBasicAuth(finalUsername, finalPassword);
     }
   }