Hi, guys! Recently started to develop full stack a...

# server

[Vasily Scherbakov]

Hi, guys! Recently started to develop full stack application using kotlin with ktor as backend. And now i have a problem with cors policy

Access to fetch at '<http://127.0.0.1:8080/api/run?userId=root&profile=test>' from origin '<http://localhost:3000>' 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. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled

As i understand, i should add origin to list of allowed origins in my backend app, i do this that way

install(CORS){
        method(HttpMethod.Get)
        method(<http://HttpMethod.Post|HttpMethod.Post>, )
        method(HttpMethod.Delete)
        anyHost()
        host("localhost")
    }

But this dont work.
This is headers of response from js clinet

'Origin': '<http://localhost:3000>',
                'Content-Type': 'application/json',
                'Accept': 'application/json',
                'Access-Control-Request-Headers': 'Content-Type, Authorization'

Can anyone help me please?

[asad.awadia]

Can you remove the host localhost line and try again?

[andylamax]

also, while installing CORS allow the authorization header as well