2.2.8 Ms-Echo-Reply Header

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The Ms-Echo-Reply header is a request header that is sent by the client when reissuing a request for a resource after receiving a 449 Retry With status code for a previous request.

The new header is defined as follows (using the Augmented Backus-Naur Form (ABNF) syntax, as specified in [RFC2616] section 2.1).

 Ms-Echo-Reply-Header = "Ms-Echo-Reply" ":" field-value
 

The field-value rule is specified in [RFC2616] section 4.2. The field value of the Ms-Echo-Reply header is opaque. Its value MUST NOT be examined by the server except as necessary to ensure its compliance with the server's implementation of the underlying HTTP protocol.