In our application we have a REST integration with another service
It worked fine untill recently, however, sometimes we are returned with 502 Bad Gateway in the application
We send HTTP requests through curl and it seems that to be working but then we are presented with the error I described above
The client is believed to have a firewall installed
Whenever we face the problem, I usually ask the administrator to turn this thing off and it does the trick but I'm not sure whether it has something to do with the code?
My question is what causes such behaviour and how to avoid it in the future?