I got something similar in my bag of stolen memes.

You misunderstand. HTTP 502 means the server is running on an old Gateway computer, and its capacitors are starting to go.

But the gateway likes it when you’re stern; haven’t you ever noticed it blinking “daddy” in binary using its led on indicator?

When some of our customers websites had this, it were actually internal problems with the webserver service (nginx) connecting to PHP processes via UNIX sockets. One time it was a permission problem and another time the server was targeted by aggressive crawling and several internal limits prevented enough processes to be available to connect to. So the "gateway" is probably the socket or its connection.

You can really see how old this meme is by the nginx version (2010), which was 14 years ago.

I really need a web extension/REST client that shows me these memes when I get error codes instead of just boring text