mitchell852 commented on issue #3887: Traffic Portal is completely blank when the TO is down URL: https://github.com/apache/trafficcontrol/issues/3887#issuecomment-525105054 Here's the issue: when you try to navigate to a "private" view in TP (every view is private except for tp.domain.com/#!/login) before the page renders, TP makes a call to GET /api/1.4/user/current using the mojolicious cookie. This will result in 1 of 3 things: 1. a 200 OK and the page will render 2. a 401 unauthorized and you will be redirected to tp.domain.com/#!/login 3. a 500 because TO is down in the first 2 cases, TP will render just fine but in the 3rd, TP will simply fail. I guess TP needs to handle the 500 better.
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