Add cookie-suffix flag (#7590)

src/node/routes/logout.ts

@@ -1,5 +1,4 @@
 import { Router } from "express"
-import { CookieKeys } from "../../common/http"
 import { getCookieOptions, redirect } from "../http"
 import { sanitizeString } from "../util"
 
@@ -7,7 +6,7 @@ export const router = Router()
 
 router.get<{}, undefined, undefined, { base?: string; to?: string }>("/", async (req, res) => {
   // Must use the *identical* properties used to set the cookie.
-  res.clearCookie(CookieKeys.Session, getCookieOptions(req))
+  res.clearCookie(req.cookieSessionName, getCookieOptions(req))
 
   const to = sanitizeString(req.query.to) || "/"
   return redirect(req, res, to, { to: undefined, base: undefined, href: undefined })