What's the difference between a 521 error and other common HTTP error codes?

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Grade: Education Subject: Support
What's the difference between a 521 error and other common HTTP error codes?
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521 is distinct from errors like 503 (Service Unavailable) and 504 (Gateway Timeout). While 503 indicates the server is temporarily unavailable and 504 means the server couldn't get a timely response from a downstream server, 521 specifically points to the server's inability to handle the current request due to overload.