diff --git a/packages/desktop/src/asset_server.rs b/packages/desktop/src/asset_server.rs
index 490e83b8..2f3bb636 100644
--- a/packages/desktop/src/asset_server.rs
+++ b/packages/desktop/src/asset_server.rs
@@ -1,4 +1,8 @@
-use std::{io::Cursor, path::PathBuf, sync::Arc};
+use std::{
+  io::Cursor,
+  path::{Path, PathBuf},
+  sync::Arc,
+};
 
 use rocket::{
   fs::NamedFile,
@@ -30,6 +34,33 @@ pub fn setup_asset_server(
   });
 }
 
+pub async fn create_init_url(
+  widget_factory: &WidgetFactory,
+  parent_dir: &Path,
+  html_path: &Path,
+) -> anyhow::Result<tauri::Url> {
+  let url = tauri::Url::parse_with_params(
+    "http://127.0.0.1:6124/__zebar/init",
+    &[
+      (
+        "token",
+        // Generate a unique token to identify requests from the
+        // widget to the asset server.
+        &widget_factory.upsert_or_get_token(parent_dir).await,
+      ),
+      (
+        "redirect",
+        &format!(
+          "/{}",
+          html_path.strip_prefix(parent_dir)?.to_unicode_string()
+        ),
+      ),
+    ],
+  )?;
+
+  Ok(url)
+}
+
 #[get("/__zebar/init?<token>&<redirect>")]
 pub fn init(
   token: String,
diff --git a/packages/desktop/src/widget_factory.rs b/packages/desktop/src/widget_factory.rs
index 67211319..2b827fce 100644
--- a/packages/desktop/src/widget_factory.rs
+++ b/packages/desktop/src/widget_factory.rs
@@ -12,7 +12,7 @@ use base64::prelude::*;
 use serde::Serialize;
 use tauri::{
   path::BaseDirectory, AppHandle, Manager, PhysicalPosition, PhysicalSize,
-  Url, WebviewUrl, WebviewWindowBuilder, WindowEvent,
+  WebviewUrl, WebviewWindowBuilder, WindowEvent,
 };
 use tokio::{
   sync::{broadcast, Mutex},
@@ -26,6 +26,7 @@ use crate::common::macos::WindowExtMacOs;
 #[cfg(target_os = "windows")]
 use crate::common::windows::{remove_app_bar, WindowExtWindows};
 use crate::{
+  asset_server::create_init_url,
   common::PathExt,
   config::{
     AnchorPoint, Config, DockConfig, DockEdge, WidgetConfig,
@@ -257,26 +258,9 @@ impl WidgetFactory {
         )
       }
 
-      let url = Url::parse_with_params(
-        "http://127.0.0.1:6124/__zebar/init",
-        &[
-          (
-            "token",
-            // Generate a unique token to identify requests from the
-            // widget to the asset server.
-            &self.upsert_or_get_token(parent_dir).await,
-          ),
-          (
-            "redirect",
-            &format!(
-              "/{}",
-              html_path.strip_prefix(parent_dir)?.to_unicode_string()
-            ),
-          ),
-        ],
-      )?;
-
-      let webview_url = WebviewUrl::External(url);
+      let webview_url = WebviewUrl::External(
+        create_init_url(self, &parent_dir, &html_path).await?,
+      );
 
       let mut state = WidgetState {
         id: widget_id.clone(),
@@ -832,7 +816,7 @@ impl WidgetFactory {
   ///
   /// If the directory does not have an existing token, a new one is
   /// generated and inserted.
-  async fn upsert_or_get_token(&self, directory: &Path) -> String {
+  pub async fn upsert_or_get_token(&self, directory: &Path) -> String {
     let mut asset_server_tokens = self.asset_server_tokens.lock().await;
 
     // Find existing token for this path.