Fix PDF loading by preserving Nextcloud headers

- Revert to synchronous download but keep 5-minute timeout
- Copy Content-Length and other headers from Nextcloud response
- Ensures PDF viewer gets proper content metadata
- Maintains streaming for audio/video with headers

go_cloud/internal/http/routes.go

@@ -3178,37 +3178,39 @@ func publicFileViewHandler(w http.ResponseWriter, r *http.Request, db *database.
 	downloadCtx, cancel := context.WithTimeout(r.Context(), 5*time.Minute)
 	defer cancel()
 
-	// Create a pipe for streaming
-	pipeReader, pipeWriter := io.Pipe()
-
-	// Start download in goroutine
-	go func() {
-		defer pipeWriter.Close()
-		resp, err := client.Download(downloadCtx, file.Path, r.Header.Get("Range"))
-		if err != nil {
-			pipeWriter.CloseWithError(err)
-			return
-		}
-		defer resp.Body.Close()
-		io.Copy(pipeWriter, resp.Body)
-	}()
+	// Stream file
+	resp, err := client.Download(downloadCtx, file.Path, r.Header.Get("Range"))
+	if err != nil {
+		errors.LogError(r, err, "Failed to download file")
+		errors.WriteError(w, errors.CodeInternal, "Server error", http.StatusInternalServerError)
+		return
+	}
+	defer resp.Body.Close()
 
 	// Add CORS headers for public access
 	w.Header().Set("Access-Control-Allow-Origin", "*")
 	w.Header().Set("Access-Control-Allow-Methods", "GET, HEAD, OPTIONS")
 	w.Header().Set("Access-Control-Allow-Headers", "Range")
 
-	// Set status code (200 or 206 for partial)
-	w.WriteHeader(200) // Assume 200 for now, or check if Range was requested
+	// Copy headers from Nextcloud response, but skip Content-Type to ensure correct MIME type
+	for k, v := range resp.Header {
+		if k != "Content-Type" {
+			w.Header()[k] = v
+		}
+	}
 
 	// Set correct Content-Type based on file extension
 	w.Header().Set("Content-Type", mimeType)
 
 	// Ensure inline viewing behavior (no Content-Disposition attachment)
+	w.Header().Del("Content-Disposition")
 	w.Header().Set("Content-Disposition", fmt.Sprintf("inline; filename=\"%s\"", file.Name))
 
-	// Copy body from pipe
-	io.Copy(w, pipeReader)
+	// Set status code (200 or 206 for partial)
+	w.WriteHeader(resp.StatusCode)
+
+	// Copy body
+	io.Copy(w, resp.Body)
 }
 
 func getUserFileShareLinkHandler(w http.ResponseWriter, r *http.Request, db *database.DB) {