Tutorial by Topics: http

In HTTP, status codes are a machine-readable mechanism indicating the result of a previously issued request. From RFC 7231, sec. 6: "The status-code element is a three-digit integer code giving the result of the attempt to understand and satisfy the request."

The formal grammar allows codes to be anything between 000 and 999. However, only the range from 100 to 599 has assigned meaning.

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