Harden codebase: fix security, quality, and maintainability issues

- Replace dangerous unwrap() with proper error handling (storage.rs, webdav.rs)
- Add atomic writes (temp + rename) for config, sync state, and metadata files
- Add path traversal validation in sync executor
- Add workspace path validation in Tauri commands
- Add input size limits for task titles, descriptions, and list names
- Add file download size limit (10MB) to WebDAV get_file
- Fix move_task rollback to log failures instead of silently ignoring
- Fix JSON serialization unwrap in Tauri create_remote_workspace
- Fix swallowed errors in sync queue backup, metadata writes, sync state load
- Extract hardcoded strings into named constants (filenames, extensions, limits)
- Use REQUEST_TIMEOUT/CONNECT_TIMEOUT constants in WebDAV client builder
- Fix frontend: clear taskStack when viewed task is deleted or list is switched
- Fix frontend: surface credential loading and focus listener errors

https://claude.ai/code/session_01F67yfLLmSaBtT7aKKNus1M

apps/tauri/src-tauri/src/lib.rs

@@ -41,6 +41,33 @@ fn lock_state(state: &Mutex<AppState>) -> Result<std::sync::MutexGuard<'_, AppSt
     state.lock().map_err(|e| format!("State lock poisoned: {}", e))
 }
 
+/// Validate that a workspace path is a reasonable directory and not a system path.
+fn validate_workspace_path(path: &str) -> Result<(), String> {
+    let p = PathBuf::from(path);
+    // Reject obviously dangerous paths
+    let normalized = p.to_string_lossy();
+    if normalized.is_empty() {
+        return Err("Workspace path cannot be empty".into());
+    }
+    // Reject paths that are system root directories
+    #[cfg(unix)]
+    {
+        let forbidden = ["/", "/etc", "/usr", "/bin", "/sbin", "/var", "/proc", "/sys", "/dev"];
+        let canonical = normalized.trim_end_matches('/');
+        if forbidden.contains(&canonical) {
+            return Err(format!("Cannot use system directory as workspace: {}", path));
+        }
+    }
+    #[cfg(windows)]
+    {
+        let upper = normalized.to_uppercase();
+        if upper.len() <= 3 && upper.ends_with(":\\") || upper.ends_with(":") {
+            return Err(format!("Cannot use drive root as workspace: {}", path));
+        }
+    }
+    Ok(())
+}
+
 /// Serializable sync result for the frontend.
 #[derive(Debug, Serialize, Deserialize, Clone)]
 struct SyncResult {
@@ -120,6 +147,7 @@ fn add_workspace(
     path: String,
     state: State<'_, Mutex<AppState>>,
 ) -> Result<(), String> {
+    validate_workspace_path(&path)?;
     let mut s = lock_state(&state)?;
     let ws = WorkspaceConfig::new(name, PathBuf::from(&path));
     let id = s.config.add_workspace(ws);
@@ -243,6 +271,7 @@ async fn rename_workspace(
 
 #[tauri::command]
 fn init_workspace(path: String) -> Result<(), String> {
+    validate_workspace_path(&path)?;
     TaskRepository::init(PathBuf::from(path))
         .map(|_| ())
         .map_err(|e| e.to_string())
@@ -625,7 +654,7 @@ async fn create_remote_workspace(
     } else {
         format!("{}/{}", path.trim_end_matches('/'), ".onyx-workspace.json")
     };
-    client.put_file(&file_path, serde_json::to_string_pretty(&metadata).unwrap().into_bytes())
+    client.put_file(&file_path, serde_json::to_string_pretty(&metadata).map_err(|e| e.to_string())?.into_bytes())
         .await
         .map_err(|e| e.to_string())?;
     Ok(())

apps/tauri/src/lib/screens/SettingsScreen.svelte

@@ -26,7 +26,9 @@
       invoke<[string, string]>("load_credentials", { domain }).then(([u, p]) => {
         webdavUser = u;
         webdavPass = p;
-      }).catch(() => {});
+      }).catch((e) => {
+        console.warn("Failed to load credentials:", e);
+      });
     } catch {}
   });
 

apps/tauri/src/lib/screens/TasksScreen.svelte

@@ -18,6 +18,13 @@
   let parentTask = $derived(taskStack.length >= 1 ? app.tasks.find(t => t.id === taskStack[0]) ?? null : null);
   let subtaskDetail = $derived(taskStack.length >= 2 ? app.tasks.find(t => t.id === taskStack[1]) ?? null : null);
 
+  // Clear taskStack when the viewed task no longer exists (e.g. deleted or list switched)
+  $effect(() => {
+    if (taskStack.length > 0 && !parentTask) {
+      taskStack = [];
+    }
+  });
+
   function openTask(task: Task) {
     taskStack = [task.id];
   }
@@ -282,7 +289,7 @@
     <div class="flex-1 overflow-y-auto py-2">
       {#each app.lists as list (list.id)}
         <button
-          onclick={() => { app.selectList(list.id); closeDrawer(); }}
+          onclick={() => { app.selectList(list.id); taskStack = []; closeDrawer(); }}
           class="group flex w-full items-center gap-2 px-5 py-2.5 text-left text-sm hover:bg-black/5 dark:hover:bg-white/10 {list.id === app.activeListId ? 'font-bold' : ''}"
         >
           {#if list.id === app.activeListId}

apps/tauri/src/lib/stores/app.svelte.ts

@@ -369,7 +369,9 @@ function startAutoSync() {
   _syncInterval = setInterval(triggerSync, syncIntervalSecs * 1000);
   getCurrentWindow().onFocusChanged(({ payload: focused }) => {
     if (focused && Date.now() - lastSyncTime > SYNC_FOCUS_THRESHOLD_MS) triggerSync();
-  }).then((unlisten) => { _focusUnlisten = unlisten; });
+  }).then((unlisten) => { _focusUnlisten = unlisten; }).catch((e) => {
+    console.warn("Failed to set up focus listener:", e);
+  });
 }
 
 function stopAutoSync() {

crates/onyx-core/src/config.rs

@@ -115,7 +115,10 @@ impl AppConfig {
             std::fs::create_dir_all(parent)?;
         }
         let content = serde_json::to_string_pretty(&self)?;
-        std::fs::write(path, content)?;
+        // Atomic write: write to temp file then rename to prevent corruption on crash
+        let temp = path.with_extension("tmp");
+        std::fs::write(&temp, &content)?;
+        std::fs::rename(&temp, path)?;
         Ok(())
     }
 

crates/onyx-core/src/repository.rs

@@ -78,7 +78,9 @@ impl TaskRepository {
         self.storage.write_task(to_list_id, &task)?;
         // If delete from source fails, roll back by removing the copy from destination
         if let Err(e) = self.storage.delete_task(from_list_id, task_id) {
-            let _ = self.storage.delete_task(to_list_id, task_id);
+            if let Err(rollback_err) = self.storage.delete_task(to_list_id, task_id) {
+                eprintln!("Warning: move_task rollback failed: {}", rollback_err);
+            }
             return Err(e);
         }
         Ok(())

crates/onyx-core/src/storage.rs

@@ -7,6 +7,30 @@ use uuid::Uuid;
 use crate::error::{Error, Result};
 use crate::models::{Task, TaskList, TaskStatus};
 
+/// Maximum allowed length for task titles.
+const MAX_TITLE_LENGTH: usize = 500;
+/// Maximum allowed length for task descriptions.
+const MAX_DESCRIPTION_LENGTH: usize = 1_000_000; // 1 MB
+/// Maximum allowed length for list names.
+const MAX_LIST_NAME_LENGTH: usize = 255;
+/// Workspace root metadata filename.
+const WORKSPACE_METADATA_FILE: &str = ".onyx-workspace.json";
+/// Per-list metadata filename.
+const LIST_METADATA_FILE: &str = ".listdata.json";
+/// Task file extension.
+const TASK_FILE_EXT: &str = "md";
+/// Default version for tasks without a version field (legacy files).
+const DEFAULT_TASK_VERSION: u64 = 1;
+
+/// Write data to a temporary file then atomically rename to the target path.
+/// Prevents corruption from partial writes on crash.
+fn atomic_write(path: &Path, content: &[u8]) -> std::io::Result<()> {
+    let temp = path.with_extension("tmp");
+    fs::write(&temp, content)?;
+    fs::rename(&temp, path)?;
+    Ok(())
+}
+
 /// Metadata stored in root .onyx-workspace.json
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct RootMetadata {
@@ -50,7 +74,7 @@ impl ListMetadata {
 }
 
 fn is_false(v: &bool) -> bool { !v }
-fn default_version() -> u64 { 1 }
+fn default_version() -> u64 { DEFAULT_TASK_VERSION }
 
 /// Frontmatter for task markdown files
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -126,7 +150,7 @@ impl FileSystemStorage {
     }
 
     fn metadata_path(&self) -> PathBuf {
-        self.root_path.join(".onyx-workspace.json")
+        self.root_path.join(WORKSPACE_METADATA_FILE)
     }
 
     fn list_dir_path(&self, list_id: Uuid) -> Result<PathBuf> {
@@ -137,7 +161,7 @@ impl FileSystemStorage {
             let entry = entry?;
             let path = entry.path();
             if path.is_dir() {
-                let listdata_path = path.join(".listdata.json");
+                let listdata_path = path.join(LIST_METADATA_FILE);
                 if listdata_path.exists() {
                     let content = fs::read_to_string(&listdata_path)?;
                     let list_metadata: ListMetadata = serde_json::from_str(&content)?;
@@ -191,7 +215,7 @@ impl FileSystemStorage {
         } else {
             safe_title
         };
-        list_dir.join(format!("{}.md", filename))
+        list_dir.join(format!("{}.{}", filename, TASK_FILE_EXT))
     }
 
     fn parse_markdown_with_frontmatter(&self, content: &str) -> Result<(TaskFrontmatter, String)> {
@@ -247,7 +271,7 @@ impl FileSystemStorage {
     fn write_root_metadata_internal(&self, metadata: &RootMetadata) -> Result<()> {
         let path = self.metadata_path();
         let content = serde_json::to_string_pretty(&metadata)?;
-        fs::write(&path, content)?;
+        atomic_write(&path, content.as_bytes())?;
         Ok(())
     }
 }
@@ -263,7 +287,7 @@ impl Storage for FileSystemStorage {
             let entry = entry?;
             let path = entry.path();
 
-            if path.is_file() && path.extension().and_then(|s| s.to_str()) == Some("md") {
+            if path.is_file() && path.extension().and_then(|s| s.to_str()) == Some(TASK_FILE_EXT) {
                 let content = fs::read_to_string(&path)?;
                 let (frontmatter, description) = self.parse_markdown_with_frontmatter(&content)?;
 
@@ -291,6 +315,13 @@ impl Storage for FileSystemStorage {
     }
 
     fn write_task(&mut self, list_id: Uuid, task: &Task) -> Result<()> {
+        if task.title.len() > MAX_TITLE_LENGTH {
+            return Err(Error::InvalidData(format!("Task title too long ({} chars, max {})", task.title.len(), MAX_TITLE_LENGTH)));
+        }
+        if task.description.len() > MAX_DESCRIPTION_LENGTH {
+            return Err(Error::InvalidData(format!("Task description too long ({} bytes, max {})", task.description.len(), MAX_DESCRIPTION_LENGTH)));
+        }
+
         let list_dir = self.list_dir_path(list_id)?;
         let task_path = self.task_file_path(&list_dir, task);
 
@@ -299,7 +330,7 @@ impl Storage for FileSystemStorage {
             let entry = entry?;
             let path = entry.path();
             if path == task_path { continue; }
-            if path.is_file() && path.extension().and_then(|s| s.to_str()) == Some("md") {
+            if path.is_file() && path.extension().and_then(|s| s.to_str()) == Some(TASK_FILE_EXT) {
                 if let Ok(content) = fs::read_to_string(&path) {
                     if let Ok((fm, _)) = self.parse_markdown_with_frontmatter(&content) {
                         if fm.id == task.id {
@@ -352,7 +383,7 @@ impl Storage for FileSystemStorage {
             let entry = entry?;
             let path = entry.path();
 
-            if path.is_file() && path.extension().and_then(|s| s.to_str()) == Some("md") {
+            if path.is_file() && path.extension().and_then(|s| s.to_str()) == Some(TASK_FILE_EXT) {
                 let content = fs::read_to_string(&path)?;
                 let (frontmatter, description) = self.parse_markdown_with_frontmatter(&content)?;
 
@@ -387,10 +418,13 @@ impl Storage for FileSystemStorage {
             if entries.len() > 1 {
                 entries.sort_by(|a, b| b.1.version.cmp(&a.1.version));
                 for (stale_path, _) in entries.drain(1..) {
-                    let _ = fs::remove_file(&stale_path);
+                    if let Err(e) = fs::remove_file(&stale_path) {
+                        eprintln!("Warning: failed to remove stale duplicate task file {:?}: {}", stale_path, e);
                     }
                 }
-            let (_, task) = entries.into_iter().next().unwrap();
+            }
+            let (_, task) = entries.into_iter().next()
+                .ok_or_else(|| Error::InvalidData("Empty dedup entries for task".to_string()))?;
             tasks.push(task);
         }
 
@@ -407,6 +441,12 @@ impl Storage for FileSystemStorage {
     }
 
     fn create_list(&mut self, name: String) -> Result<TaskList> {
+        if name.trim().is_empty() {
+            return Err(Error::InvalidData("List name cannot be empty".to_string()));
+        }
+        if name.len() > MAX_LIST_NAME_LENGTH {
+            return Err(Error::InvalidData(format!("List name too long ({} chars, max {})", name.len(), MAX_LIST_NAME_LENGTH)));
+        }
         let list_dir = self.list_dir_path_by_name(&name)?;
 
         if list_dir.exists() {
@@ -420,7 +460,7 @@ impl Storage for FileSystemStorage {
 
         let metadata_path = list_dir.join(".listdata.json");
         let content = serde_json::to_string_pretty(&list_metadata)?;
-        fs::write(&metadata_path, content)?;
+        atomic_write(&metadata_path, content.as_bytes())?;
 
         // Add to root metadata
         let mut root_metadata = self.read_root_metadata_internal()?;
@@ -453,7 +493,7 @@ impl Storage for FileSystemStorage {
             let path = entry.path();
 
             if path.is_dir() {
-                let listdata_path = path.join(".listdata.json");
+                let listdata_path = path.join(LIST_METADATA_FILE);
                 if listdata_path.exists() {
                     let content = fs::read_to_string(&listdata_path)?;
                     let list_metadata: ListMetadata = serde_json::from_str(&content)?;
@@ -508,6 +548,12 @@ impl Storage for FileSystemStorage {
     }
 
     fn rename_list(&mut self, list_id: Uuid, new_name: String) -> Result<()> {
+        if new_name.trim().is_empty() {
+            return Err(Error::InvalidData("List name cannot be empty".to_string()));
+        }
+        if new_name.len() > MAX_LIST_NAME_LENGTH {
+            return Err(Error::InvalidData(format!("List name too long ({} chars, max {})", new_name.len(), MAX_LIST_NAME_LENGTH)));
+        }
         let old_dir = self.list_dir_path(list_id)?;
         let new_dir = self.list_dir_path_by_name(&new_name)?;
 
@@ -523,7 +569,7 @@ impl Storage for FileSystemStorage {
         let mut metadata: ListMetadata = serde_json::from_str(&content)?;
         metadata.updated_at = Utc::now();
         let json = serde_json::to_string_pretty(&metadata)?;
-        fs::write(&metadata_path, json)?;
+        atomic_write(&metadata_path, json.as_bytes())?;
 
         Ok(())
     }
@@ -554,7 +600,7 @@ impl Storage for FileSystemStorage {
         let metadata_path = list_dir.join(".listdata.json");
 
         let content = serde_json::to_string_pretty(&metadata)?;
-        fs::write(&metadata_path, content)?;
+        atomic_write(&metadata_path, content.as_bytes())?;
         Ok(())
     }
 }

crates/onyx-core/src/sync.rs

@@ -265,7 +265,9 @@ impl OfflineQueue {
                 Err(e) => {
                     eprintln!("Warning: corrupt sync queue, backing up and resetting: {}", e);
                     let backup = workspace_path.join(".syncqueue.json.bak");
-                    let _ = std::fs::copy(&queue_path, &backup);
+                    if let Err(backup_err) = std::fs::copy(&queue_path, &backup) {
+                        eprintln!("Warning: failed to backup corrupt sync queue: {}", backup_err);
+                    }
                     Self::default()
                 }
             },
@@ -281,12 +283,17 @@ impl OfflineQueue {
         if self.operations.is_empty() {
             // Clean up empty queue file
             if queue_path.exists() {
-                let _ = std::fs::remove_file(&queue_path);
+                if let Err(e) = std::fs::remove_file(&queue_path) {
+                    eprintln!("Warning: failed to remove empty sync queue file: {}", e);
+                }
             }
             return Ok(());
         }
         let content = serde_json::to_string_pretty(self)?;
-        std::fs::write(&queue_path, content)?;
+        // Atomic write: write to temp then rename
+        let temp_path = workspace_path.join(".syncqueue.json.tmp");
+        std::fs::write(&temp_path, &content)?;
+        std::fs::rename(&temp_path, &queue_path)?;
         Ok(())
     }
 
@@ -349,16 +356,21 @@ pub fn compute_checksum(data: &[u8]) -> String {
     format!("{:x}", hasher.finalize())
 }
 
+/// Workspace root metadata filename.
+const WORKSPACE_METADATA_FILE: &str = ".onyx-workspace.json";
+/// Per-list metadata filename.
+const LIST_METADATA_FILE: &str = ".listdata.json";
+
 /// Check if a file is syncable: *.md files and metadata files at expected depths.
 fn is_syncable(path: &str) -> bool {
     let parts: Vec<&str> = path.split('/').collect();
     let filename = parts.last().copied().unwrap_or(path);
     // .onyx-workspace.json only at workspace root (depth 1)
-    if filename == ".onyx-workspace.json" {
+    if filename == WORKSPACE_METADATA_FILE {
         return parts.len() == 1;
     }
     // .listdata.json only inside a list directory (depth 2)
-    if filename == ".listdata.json" {
+    if filename == LIST_METADATA_FILE {
         return parts.len() == 2;
     }
     // .md files inside a list directory (depth 2)
@@ -451,15 +463,27 @@ impl SyncState {
             return Self::default();
         }
         match std::fs::read_to_string(&state_path) {
-            Ok(content) => serde_json::from_str(&content).unwrap_or_default(),
+            Ok(content) => match serde_json::from_str(&content) {
-            Err(_) => Self::default(),
+                Ok(state) => state,
+                Err(e) => {
+                    eprintln!("Warning: corrupt sync state file, resetting: {}", e);
+                    Self::default()
+                }
+            },
+            Err(e) => {
+                eprintln!("Warning: failed to read sync state file: {}", e);
+                Self::default()
+            }
         }
     }
 
     pub fn save(&self, workspace_path: &Path) -> Result<()> {
         let state_path = workspace_path.join(".syncstate.json");
         let content = serde_json::to_string_pretty(self)?;
-        std::fs::write(&state_path, content)?;
+        // Atomic write: write to temp file then rename to prevent corruption on crash
+        let temp_path = workspace_path.join(".syncstate.json.tmp");
+        std::fs::write(&temp_path, &content)?;
+        std::fs::rename(&temp_path, &state_path)?;
         Ok(())
     }
 
@@ -589,6 +613,16 @@ async fn sync_workspace_inner(
     Ok(result)
 }
 
+/// Validate that a sync path doesn't escape the workspace via path traversal.
+fn validate_sync_path(path: &str) -> Result<()> {
+    for component in path.split('/') {
+        if component == ".." || component.contains('\\') {
+            return Err(Error::Sync(format!("Path traversal not allowed: {}", path)));
+        }
+    }
+    Ok(())
+}
+
 /// Execute a single sync action.
 async fn execute_action(
     client: &WebDavClient,
@@ -598,6 +632,9 @@ async fn execute_action(
     remote_meta: &HashMap<&str, &RemoteFileSnapshot>,
     report: &(dyn Fn(&str) + Send + Sync),
 ) -> Result<()> {
+    // Validate path before any file system operation
+    validate_sync_path(action.path())?;
+
     match action {
         SyncAction::Upload { path } => {
             let local_path = workspace_path.join(path.replace('/', std::path::MAIN_SEPARATOR_STR));
@@ -681,7 +718,9 @@ async fn execute_action(
                                         .unwrap_or(metadata.task_order.len());
                                     metadata.task_order.insert(insert_pos, new_id);
                                     if let Ok(json) = serde_json::to_string_pretty(&metadata) {
-                                        let _ = std::fs::write(&listdata_path, json);
+                                        if let Err(e) = std::fs::write(&listdata_path, json) {
+                                            eprintln!("Warning: failed to update listdata after conflict recovery: {}", e);
+                                        }
                                     }
                                 }
                             }

crates/onyx-core/src/webdav.rs

@@ -5,6 +5,9 @@ use crate::error::{Error, Result};
 
 /// Hard timeout for any WebDAV network operation.
 pub const REQUEST_TIMEOUT: Duration = Duration::from_secs(30);
+const CONNECT_TIMEOUT: Duration = Duration::from_secs(10);
+/// Maximum size for file downloads (10 MB).
+const MAX_FILE_BYTES: u64 = 10 * 1024 * 1024;
 
 /// Information about a file on the remote WebDAV server.
 #[derive(Debug, Clone)]
@@ -36,8 +39,8 @@ impl WebDavClient {
         let base_url = base_url.trim_end_matches('/').to_string();
         Self {
             _client: Client::builder()
-                .timeout(Duration::from_secs(30))
+                .timeout(REQUEST_TIMEOUT)
-                .connect_timeout(Duration::from_secs(10))
+                .connect_timeout(CONNECT_TIMEOUT)
                 .build()
                 .unwrap_or_else(|_| Client::new()),
             _base_url: base_url,
@@ -64,7 +67,7 @@ impl WebDavClient {
     /// Test connection by issuing a PROPFIND depth 0 on the root.
     pub async fn test_connection(&self) -> Result<()> {
         let resp = self._client
-            .request(reqwest::Method::from_bytes(b"PROPFIND").unwrap(), &self._base_url)
+            .request(reqwest::Method::from_bytes(b"PROPFIND").expect("PROPFIND is a valid HTTP method"), &self._base_url)
             .basic_auth(self._username.as_str(), Some(self._password.as_str()))
             .header("Depth", "0")
             .header("Content-Type", "application/xml")
@@ -86,7 +89,7 @@ impl WebDavClient {
     pub async fn list_files(&self, path: &str) -> Result<Vec<RemoteFileInfo>> {
         let url = self.full_url(path);
         let resp = self._client
-            .request(reqwest::Method::from_bytes(b"PROPFIND").unwrap(), &url)
+            .request(reqwest::Method::from_bytes(b"PROPFIND").expect("PROPFIND is a valid HTTP method"), &url)
             .basic_auth(self._username.as_str(), Some(self._password.as_str()))
             .header("Depth", "1")
             .header("Content-Type", "application/xml")
@@ -129,7 +132,15 @@ impl WebDavClient {
             return Err(Error::WebDav(format!("GET failed with status {}", status)));
         }
 
-        Ok(resp.bytes().await?.to_vec())
+        if resp.content_length().unwrap_or(0) > MAX_FILE_BYTES {
+            return Err(Error::WebDav(format!("File too large (>{}MB)", MAX_FILE_BYTES / (1024 * 1024))));
+        }
+        let bytes = resp.bytes().await?;
+        if bytes.len() as u64 > MAX_FILE_BYTES {
+            return Err(Error::WebDav(format!("File too large (>{}MB)", MAX_FILE_BYTES / (1024 * 1024))));
+        }
+
+        Ok(bytes.to_vec())
     }
 
     /// Upload a file.
@@ -172,7 +183,7 @@ impl WebDavClient {
     pub async fn create_dir(&self, path: &str) -> Result<()> {
         let url = self.full_url(path);
         let resp = self._client
-            .request(reqwest::Method::from_bytes(b"MKCOL").unwrap(), &url)
+            .request(reqwest::Method::from_bytes(b"MKCOL").expect("MKCOL is a valid HTTP method"), &url)
             .basic_auth(self._username.as_str(), Some(self._password.as_str()))
             .send()
             .await?;
@@ -192,7 +203,7 @@ impl WebDavClient {
         let from_url = self.full_url(from);
         let to_url = self.full_url(to);
         let resp = self._client
-            .request(reqwest::Method::from_bytes(b"MOVE").unwrap(), &from_url)
+            .request(reqwest::Method::from_bytes(b"MOVE").expect("MOVE is a valid HTTP method"), &from_url)
             .basic_auth(self._username.as_str(), Some(self._password.as_str()))
             .header("Destination", &to_url)
             .header("Overwrite", "F")