2.2.2.2 HTTP Header Fields Introduced by the BITS Upload Protocol

BITS-Packet-Type (section 2.2.1.2): The value of this field MUST be CREATE-SESSION for this message type.

BITS-Supported-Protocols: This represents a space-delimited or comma-delimited list of the protocols that the client supports. A GUID (as specified in [MS-DTYP] section 2.3.4.3) MUST be used to represent each protocol. The list MUST be ordered with the most preferred protocol being the head of the list. This field MUST be present.<6>