diff --git a/src/node/routes/domainProxy.ts b/src/node/routes/domainProxy.ts
index 26a3fa6f..56b0ea1b 100644
--- a/src/node/routes/domainProxy.ts
+++ b/src/node/routes/domainProxy.ts
@@ -74,14 +74,14 @@ router.all("*", async (req, res, next) => {
 
 export const wsRouter = WsRouter()
 
-wsRouter.ws("*", (req, _, next) => {
+wsRouter.ws("*", async (req, _, next) => {
   const port = maybeProxy(req)
   if (!port) {
     return next()
   }
 
   // Must be authenticated to use the proxy.
-  ensureAuthenticated(req)
+  await ensureAuthenticated(req)
 
   proxy.ws(req, req.ws, req.head, {
     ignorePath: true,
diff --git a/src/node/routes/pathProxy.ts b/src/node/routes/pathProxy.ts
index 789fa5c1..e3200174 100644
--- a/src/node/routes/pathProxy.ts
+++ b/src/node/routes/pathProxy.ts
@@ -45,13 +45,13 @@ export function proxy(
   })
 }
 
-export function wsProxy(
+export async function wsProxy(
   req: pluginapi.WebsocketRequest,
   opts?: {
     passthroughPath?: boolean
   },
-): void {
-  ensureAuthenticated(req)
+): Promise<void> {
+  await ensureAuthenticated(req)
   _proxy.ws(req, req.ws, req.head, {
     ignorePath: true,
     target: getProxyTarget(req, opts?.passthroughPath),
diff --git a/src/node/routes/static.ts b/src/node/routes/static.ts
index 5ba6983e..29a1ad3b 100644
--- a/src/node/routes/static.ts
+++ b/src/node/routes/static.ts
@@ -18,7 +18,7 @@ router.get("/(:commit)(/*)?", async (req, res) => {
   // Used by VS Code to load extensions into the web worker.
   const tar = getFirstString(req.query.tar)
   if (tar) {
-    ensureAuthenticated(req)
+    await ensureAuthenticated(req)
     let stream: Readable = tarFs.pack(pathToFsPath(tar))
     if (req.headers["accept-encoding"] && req.headers["accept-encoding"].includes("gzip")) {
       logger.debug("gzipping tar", field("path", tar))
diff --git a/typings/pluginapi.d.ts b/typings/pluginapi.d.ts
index f7797b6d..881aa1fb 100644
--- a/typings/pluginapi.d.ts
+++ b/typings/pluginapi.d.ts
@@ -145,12 +145,12 @@ export const proxy: ProxyServer
 /**
  * Middleware to ensure the user is authenticated. Throws if they are not.
  */
-export function ensureAuthenticated(req: express.Request, res?: express.Response, next?: express.NextFunction): void
+export function ensureAuthenticated(req: express.Request, res?: express.Response, next?: express.NextFunction): Promise<void>
 
 /**
  * Returns true if the user is authenticated.
  */
-export function authenticated(req: express.Request): boolean
+export function authenticated(req: express.Request): Promise<void>
 
 /**
  * Replace variables in HTML: TO, BASE, CS_STATIC_BASE, and OPTIONS.