gui-web: Use the document url as the the API url

gui/src/lib.rs

@@ -96,12 +96,18 @@ pub fn run() -> Result<(), anyhow::Error> {
         .inspect_err(|err| eprintln!("{err:?}"))
         .unwrap_or_default();
 
-    #[cfg(target_arch = "wasm32")]
-    let conf = Config::default();
-
     #[cfg(target_os = "android")]
     let conf = Config::default();
 
+    #[cfg(target_arch = "wasm32")]
+    let mut conf = Config::default();
+
+    #[cfg(target_arch = "wasm32")]
+    web_sys::window()
+        .and_then(|window| window.document())
+        .and_then(|document| document.url().ok())
+        .map(|url| conf.address = url);
+
     state.set_server_address(conf.address.to_shared_string());
     let conf_shared = Arc::new(Mutex::new(conf));