Oh my, our frontend (FE) dev is amazing! He never ceases surprising me :D
[FTR: I'm building backend (BE).]

Here's a message at Trello I found today:

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Hey @netikras
responseBody e --> Whoops! Lost connection to http://test.application.com/chat/...**************
Do you return this error to FE as a string when FE loses connection to BE?
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I mean.. come on buddy :D Use that gray mass of yours