add some no-cache headers

src/lib.rs

@@ -81,7 +81,8 @@ async fn default_route(_req: Request, url: Url) -> MyResult<Response> {
                     ResponseInit::new()
                         .status(200)
                         .headers(headers!{
-                            "Content-Type" => "text/html"
+                            "Content-Type" => "text/html",
+                            "Cache-Control" => "no-cache"
                         }.as_ref())
                 ).internal_err();
             }

src/sn.rs

@@ -79,7 +79,8 @@ async fn get_actions(_req: Request, url: Url) -> MyResult<Response> {
         ResponseInit::new()
             .status(200)
             .headers(headers!{
-                "Content-Type" => "application/json"
+                "Content-Type" => "application/json",
+                "Cache-Control" => "no-cache"
             }.add_cors().as_ref())
     ).internal_err()
 }