Fix HSTS header

src/invidious.cr

@@ -160,6 +160,10 @@ get "/" do |env|
   templated "index"
 end
 
+before_all do |env|
+  env.response.headers.add("Strict-Transport-Security", "max-age=31536000; includeSubDomains; preload")
+end
+
 get "/watch" do |env|
   if env.params.query["v"]?
     id = env.params.query["v"]
@@ -342,12 +346,11 @@ end
 if Kemal.config.ssl && redirect
   spawn do
     server = HTTP::Server.new("0.0.0.0", 80) do |context|
-      context.response.headers.add "Strict-Transport-Security", "max-age=31536000; includeSubDomains; preload"
       redirect_url = "https://#{context.request.host}#{context.request.path}"
       if context.request.query
         redirect_url += "?#{context.request.query}"
       end
-      context.response.headers.add "Location", redirect_url
+      context.response.headers.add("Location", redirect_url)
       context.response.status_code = 301
     end