Status codes defined by IETF are listed below. Emphasized terms , and are interpretation guidelines as given by .

1xx informational response

An informational response indicates that the request was received and understood and is being processed. It alerts the client to wait for a final response. The message does not contain a body. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions.

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