Question
What's the difference between a 521 error and other common HTTP error codes?
Asked by: USER9347
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76 Answers
Answer (76)
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.