While creating Trello Card by invoking the post request ( https://api.trello.com/1/cards?) (Trello card having description of size more than 10 or 11 KB) i am getting "upstream connect error or disconnect/reset before headers. reset reason: connection termination" error
That doesn't look like a generic Trello API error - my best guess is that Trello was having an outage. 10 or 11 KB description should be fine.
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