The username/password prompt for HTTP Basic Authentication is not displayed a second time. This seems to be related to various errors that are logged to the Browser Console (see attached log). To reproduce this problem: 1. Open https://www.httpwatch.com/httpgallery/authentication/ 2. Click the "Display Image" button within Example 10 on that page. 3. When prompted, enter httpwatch for the username and any password. 4. Click the "Display Image" button a second time. Expected result: a new username / password prompt. Actual result: no prompt.