Login not working when linking to index directly

[JBGruber]

When authentication is enabled and one tries access a specific index with guest access (e.g., http://localhost/h/localhost%2Famcat/i/state_of_the_union/query), this screen is shown:

Clicking the button does not do anything (the browser console also does not show any errors). To resolve it, the user has to manually navigate to the amcat4client address (in this case http://localhost/), log in as guest and can then access the original URL.