2.2.7 Ms-Echo-Request Header

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The Ms-Echo-Request header is a response header. It is returned by the server when replying to a request with the 449 Retry With status code.

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

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

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