How can I suppress the browser’s authentication dialog?

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I encountered the same issue here, and the backend engineer at my company implemented a behavior that is apparently considered a good practice : when a call to a URL returns a 401, if the client has set the header X-Requested-With: XMLHttpRequest, the server drops the www-authenticate header in its response.

The side effect is that the default authentication popup does not appear.

Make sure that your API call has the X-Requested-With header set to XMLHttpRequest. If so there is nothing to do except changing the server behavior according to this good practice…

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