Bad gateway might occur due to an incorrect setting in your Proxy.
It is recommended by me to use Nginx as it is easy to setup and apparently automatically recovers after a bad gateway.
What Operating System Are you using?
when I post, if choose the first category, it seem something error.give me "category does not exist"
if I choose the second category,no this error,but zhe post will appear to first category ,this is wrong.
only on safari.I test my nodebb :sns.widora.io and community.nodebb.org.
that seems no this error on chrome.
I git clone v1.x.x branch.
today I git reset --hard fdd8514, then work OK!