Using dockerized Ory Kratos and Angular (www folder hosted via nginx to be able to modify headers) on localhost and trying to execute

```
const headers = {
   Accept: 'application/json',
};
fetch('http://127.0.0.1:4433/self-service/registration/browser', {
  method: 'GET', 
  headers,
  redirect: 'follow',
  credentials: 'include',
})
.then((r) => console.log(r))
.catch((f) => console.log(f));

```

leads to

> 
> Access to fetch at 'http://127.0.0.1:8100/auth/register?flow=b35c3f9a-5592-4121-80b9-87503c38e1d3' (redirected from 'http://127.0.0.1:4433/self-service/registration/browser') from origin 'http://127.0.0.1:8100' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header has a value 'http://127.0.0.1:8100' that is not equal to the supplied origin. Have the server send the header with a valid value, or, if an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.
> 
> 
> 

<http://127.0.0.1:4433/self-service/registration/browser> redirects to [http://127.0.0.1:8100/custompath/register?flow=[some-flow-id]](http://127.0.0.1:8100/custompath/register?flow=%5Bsome-flow-id%5D) via a 302 HTTP response. The browser tries to resolve the redirect and throws the error mentioned above.

**Origin and allowed origin are the same** - so how can that error happen? I already found this answer on stackoverflow: <https://stackoverflow.com/a/62320912/14345380> if that's helpful.

Chrome version 87.0.4280.88

**Edit #1**
Network tab output can be seen
[here](https://i.stack.imgur.com/BCWZ4.png)

**Edit #2**
To be able to resolve the issue yourself I set up a little repository: Find it [here](https://github.com/TMInnovations/testorykratos)

**Edit #3**
Thanks for the hint from [pandamakes](https://stackoverflow.com/users/6059235/pandamakes). The test repo is not running on :8100 but on 4200 (Switched from ionic project to angular project).

**Edit #4**
I started another discussion at the ory/kratos project origin [here](https://github.com/ory/kratos/discussions/915). The Ory Team implemented a SDK which we can use instead of plain fetch requests.