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2.2.3.5 $F (Filler)

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The purpose of the $F (Filler) packet is to increase the size of the message body of the POST request in order to ensure that the total length of the message body equals the size specified by the client in the Content-Length header (defined in [RFC2616] section 14.13).

The $F packet MUST start with a Framing header (section 2.2.3.1.1) with the following additional details.

PacketID: This field MUST be set to the character "F" (0x46).

Reason: This field MUST NOT be present.

The variable-size Payload field MUST consist of zero or more padding bytes. The maximum size of this field is 65,531 bytes. Each byte SHOULD be set to 0x00 and MUST be ignored by the server.