Bad gateway errors are never intentional. Receiving one just means the server had an issue processing your request. If it immediately resolves itself, it's not really an issue. If a page only ever gives you a 502, that's a problem. Ideally we'd never have any 502s happening, but certain race conditions have them pop up on occasion and it can be annoying to track down.
Cloudflare check on posting is intentional. It breaks enough of the automated bots that it has become a neccessary evil.
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