feat: return non-OK responses from fetchWithRetry and pass upstream errors through the proxy API.

Author: KuekHaoYang

app/api/proxy/route.ts

@@ -26,6 +26,19 @@ export async function GET(request: NextRequest) {
 
         const response = await fetchWithRetry({ url, request, headers: requestHeaders });
 
+        // If upstream returned an error, pass it through with CORS headers
+        if (!response.ok) {
+            const errorText = await response.text();
+            return new NextResponse(errorText || `Upstream error: ${response.status}`, {
+                status: response.status,
+                statusText: response.statusText,
+                headers: {
+                    'Content-Type': response.headers.get('Content-Type') || 'text/plain',
+                    'Access-Control-Allow-Origin': '*',
+                },
+            });
+        }
+
         const contentType = response.headers.get('Content-Type');
 
         // Better M3U8 detection: check both content-type and actual content

lib/utils/fetch-with-retry.ts

@@ -76,8 +76,16 @@ export async function fetchWithRetry({ url, request, headers = {} }: FetchWithRe
         }
     }
 
-    if (!response || !response.ok) {
-        throw new Error(`Failed after ${MAX_RETRIES} attempts: ${response?.status || lastError}`);
+    // If we got a response (even an error response like 403, 404), return it
+    // Only throw if we truly failed to get any response
+    if (!response) {
+        throw new Error(`Failed after ${MAX_RETRIES} attempts: ${lastError}`);
+    }
+
+    // Return the response even if it's an error status (403, 404, etc.)
+    // The caller can check response.ok or response.status
+    if (!response.ok) {
+        console.warn(`⚠ Returning non-OK response: ${response.status} ${response.statusText}`);
     }
 
     return response;