Could you mark one of our posts as the solution? To help future readers?
I would recommend u mark this as the solution since it explains why u got this error in the first place
Just to clarify for why you might be getting a 504 gateway timeout instead of getting an error response - it’s because a promise was never created since in my case fetch was never defined. So the proxy server will stop functioning at that point and end up hanging the request.
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Using ur own proxy server is definitely better, by the way. I just learned some cyber security aspect of networking 
, and I’ve changed all my discord webhook to my own proxy server.