Response Headers got cleared after deployment

i have set some headers from code these are set there but after deployment headers not coming and getting cors error because headers are not set


app.use((req, res, next) => {
res.header(“Access-Control-Allow-Origin”, “http://localhost:3000”);
“Origin, X-Requested-With, Content-Type, Accept, Authorization”
res.header(“Access-Control-Allow-Credentials”, true);
if (req.method === “OPTIONS”) {
“Origin, X-Requested-With, Content-Type, Accept, Authorization”
res.header(“Access-Control-Allow-Methods”, “GET, POST, PUT, DELETE, PATCH”);
return res.status(200).json({});

Access to XMLHttpRequest at ‘’ from origin has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

but not get this error when run in local

Hi there,

This is likely an application-level issue, so we are limited in our ability to assist you here.

That said, on an initial look, you may need to adjust your Access-Control-Allow-Origin, as as the host will not be localhost in a hosted environment.

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