fix: streaming issue fixed for build versions (#1006)

* fix: streaming issue fixed for build versions

* added keep-alive header

app/routes/api.chat.ts

@@ -139,7 +139,8 @@ async function chatAction({ context, request }: ActionFunctionArgs) {
     return new Response(stream.readable, {
       status: 200,
       headers: {
-        contentType: 'text/plain; charset=utf-8',
+        contentType: 'text/event-stream',
+        connection: 'keep-alive',
       },
     });
   } catch (error: any) {