How did You configure CORS? I had to update my endpoint to make it work (with Corsica).

Something like this…

  plug Corsica,
    origins: [
      "http://localhost:4000",
      "http://localhost:8000",
      "http://localhost:8080"
    ],
    allow_headers: ["accept", "content-type", "authorization"],
    allow_credentials: true,
    log: [rejected: :error, invalid: :warn, accepted: :debug]

Of course your configuration may vary a lot…

Hello @dumadi, your API use Elixir? In my case, I solved that problem using [cors_plug]. I had an umbrella project (as my API), and I put that plug inside the project with the endpoint.

I modified the Router, something like this:

defmodule APIWeb.Router do
  use APIWeb, :router

  pipeline :any_name do
    plug CORSPlug, origin: "*"
    ...
  end

  scope "/" do
    ...
    pipe_through(:any_name)
    ...
  end
end

If you have an API in another language, you need to investigate how to configure the cors.
I used this tutorial for express: cors middleware · Express.js

@dumadi If you can’t solve that problem, let me know and I’m going to help you