NavigationManager.NavigateTo("urlInOtherDomain") causes Uncaught (in promise) WebSocket is not in the OPEN state in Firefox

[bc3]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

existing item: #19050

let this simple piece of code in a blazor server app

@page "/"
@inject NavigationManager NavManager

<PageTitle>Index</PageTitle>

<h1>Hello, world!</h1>

Welcome to your new app.

<SurveyPrompt Title="How is Blazor working for you?" />

<button onclick="@navigate">direct with js NavigationManager</button>

@code{
    public void navigate() {
        NavManager.NavigateTo("https://www.google.com");
    }
}

it runs fine in chrome, when you run it in firefox, you get exception: Uncaught (in promise) WebSocket is not in the OPEN state

Firefox.WebSocket.not.in.OPEN.state.mov

it is already described in #19050 and closed in #23224, but the problem still remains

Expected Behavior

it just goes to google without the socketexception, this is a simple version of our code. In our main project it is used to downlad a CSV file, and now the user always sees blazor disconnect.

Steps To Reproduce

use code snippet

Exceptions (if any)

Uncaught (in promise) WebSocket is not in the OPEN state

.NET Version

7

Anything else?

No response

[mkArtakMSFT]

Thanks for contacting us. This is because the onBeforeUnload event is not reliable. The framework listens to that event and uses that as a signal to disconnect the circuit. However, because of the unreliability nature of that event, sometimes it doesn't fire and you end up seeing the exception that you've observed.
That said, it's safe to ignore that exception. We're closing this as the framework has no control over that event and it's a browser behavior: https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event#usage_notes