From a339574f058f1a924becf5fe2c1bb2f796382702 Mon Sep 17 00:00:00 2001
From: Josh Patra <joshpatra12@gmail.com>
Date: Fri, 30 Jan 2026 22:02:35 -0500
Subject: [PATCH] fix: forward caching headers for client-side caching

Jellyfin sends ETag, Last-Modified, and Cache-Control headers that allow clients like Feishin to cache songs locally. Proxy now forwards these headers so clients don't re-download songs unnecessarily.
---
 allstarr/Controllers/JellyfinController.cs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/allstarr/Controllers/JellyfinController.cs b/allstarr/Controllers/JellyfinController.cs
index b45b055..5d7cecf 100644
--- a/allstarr/Controllers/JellyfinController.cs
+++ b/allstarr/Controllers/JellyfinController.cs
@@ -778,6 +778,23 @@ public class JellyfinController : ControllerBase
             
             var contentType = response.Content.Headers.ContentType?.ToString() ?? "audio/mpeg";
             
+            // Forward caching headers for client-side caching
+            if (response.Headers.ETag != null)
+            {
+                Response.Headers["ETag"] = response.Headers.ETag.ToString();
+            }
+            
+            if (response.Content.Headers.LastModified.HasValue)
+            {
+                Response.Headers["Last-Modified"] = response.Content.Headers.LastModified.Value.ToString("R");
+            }
+            
+            if (response.Headers.CacheControl != null)
+            {
+                Response.Headers["Cache-Control"] = response.Headers.CacheControl.ToString();
+            }
+            
+            // Forward range headers for seeking
             if (response.Content.Headers.ContentRange != null)
             {
                 Response.Headers["Content-Range"] = response.Content.Headers.ContentRange.ToString();