$http_rs shows 401 even when final response is 201 (http_async_query + Basic Auth)

Hi all,

I'm seeing some unexpected behavior from $http_rs when using
http_async_query() to send a POST request to an endpoint that requires
Basic (username/password) authentication.

When I use:

```
$http_req(username) = "someuser";
$http_req(password) = "somepass";
```

the request goes through and the server responds with a *201 Created*, as
expected. The response body ($http_rb) contains the correct result.
However, $http_rs still shows *401 Unauthorized*.

I believe this happens because curl receives a 401 challenge first, then
retries with the provided credentials and gets the correct 201. It seems
$http_rs is reflecting the status from the initial challenge rather than
the final response. This is on Kamailio v6.0.1.

As a workaround, I tried manually setting the *Authorization* header like
this:

```
$var(credentials) = "someuser:somepass";
$http_req(hdr) = "Authorization: Basic " +
$(var(credentials){s.encode.base64});
```

In that case, $http_rs correctly shows 201.

Is it expected for $http_rs to stay at 401 in the first scenario? Or should
it reflect the final status code after curl completes the full request
cycle?

Thanks,
Joel.

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