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2.2.1.4.2 AccelDuration

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When used in a request, this token specifies the amount of multimedia data, in millisecond units, that the client requests the server to transmit at the bandwidth specified by the AccelBW (section 2.2.1.4.1) token.

When used in a response, this token specifies the amount of multimedia data, in milliseconds, that the server intends to transmit at the bandwidth specified by the AccelBW token of the server.

The AccelDuration token is defined only for servers that have a version greater than or equal to 5.0 (as specified by the server in the Server header), and only for clients that have a version greater than or equal to 8.0 (as specified by the client in the User-Agent header).<18>

The value MUST be an integer in the range from 0 through 4,294,967,295. If the value is 0, then the token is ignored.

The syntax of the AccelDuration token is defined as follows.

 AccelDuration   = "AccelDuration=" 1*10DIGIT

Although not required, the AccelBW, AccelDuration, and LinkBW tokens are typically grouped together as shown in the following example.

 Pragma: LinkBW=2147483647, AccelBW=1048576, AccelDuration=5000