diff --git a/src/server.ts b/src/server.ts
index 03f7442..1f992b6 100644
--- a/src/server.ts
+++ b/src/server.ts
@@ -139,9 +139,18 @@ function html(body: string, cache = "no-cache") {
   })
 }
 
-function langRedirectPage(rest: string): string {
-  const fr = `${SITE_URL}/fr${rest}`
-  const en = `${SITE_URL}/en${rest}`
+function baseUrl(req: Request, fallback = SITE_URL): string {
+  const host = (req.headers.get("host") || "").trim()
+  if (!host) return fallback
+  // Tor = HTTP, tout le reste est servi en HTTPS (le schéma suit l'hôte courant,
+  // pour que la redirection de langue reste sur le domaine actuel, .onion compris).
+  const scheme = host.toLowerCase().endsWith(".onion") ? "http" : "https"
+  return `${scheme}://${host}`
+}
+
+function langRedirectPage(rest: string, base: string): string {
+  const fr = `${base}/fr${rest}`
+  const en = `${base}/en${rest}`
   const restJs = JSON.stringify(rest)
   return `<!doctype html>
 <html lang="fr">
@@ -154,18 +163,18 @@ function langRedirectPage(rest: string): string {
     <link rel="alternate" hreflang="fr" href="${fr}" />
     <link rel="alternate" hreflang="en" href="${en}" />
     <link rel="alternate" hreflang="x-default" href="${fr}" />
-    <meta http-equiv="refresh" content="0; url=${fr}" />
+    <meta http-equiv="refresh" content="1.5; url=/fr${rest}" />
     <script>(function(){
       var rest=${restJs};
+      var saved=null;
+      try{ saved=localStorage.getItem("zektyc-lang"); }catch(e){}
       var target="/fr"+rest;
-      try{
-        var saved=localStorage.getItem("zektyc-lang");
-        if(saved==="en"||saved==="fr"){ target="/"+saved+rest; }
-        else {
-          var ln=(navigator.language||navigator.userLanguage||"").toLowerCase();
-          if(ln.indexOf("en")===0) target="/en"+rest;
-        }
-      }catch(e){}
+      if(saved==="en"||saved==="fr"){
+        target="/"+saved+rest;
+      } else {
+        var ln=(navigator.languages&&navigator.languages.length?navigator.languages[0]:(navigator.language||navigator.userLanguage||"")).toLowerCase();
+        if(ln.indexOf("en")===0) target="/en"+rest;
+      }
       if(target.indexOf("/en")===0){
         fetch(target,{method:"HEAD",cache:"no-store"}).then(function(r){
           location.replace(r.ok?target:"/fr"+rest);
@@ -1288,8 +1297,8 @@ server = serve({
         return new Response(null, { status: 301, headers: { Location: `/en/zmap${sub}/` } })
       }
       const artMatch = matchArticle(pathname, articles)
-      if (artMatch) return html(langRedirectPage(artPath(artMatch)), "no-cache")
-      if (isHtmlFile(pathname)) return html(langRedirectPage(pathname === "/" ? "/" : pathname), "no-cache")
+      if (artMatch) return html(langRedirectPage(artPath(artMatch), baseUrl(req)), "no-cache")
+      if (isHtmlFile(pathname)) return html(langRedirectPage(pathname === "/" ? "/" : pathname, baseUrl(req)), "no-cache")
     }
 
     const p = resolveLangPath(pathname) ?? pathname
