public virtual IEnumerable<PreparedExtensionHeader> PrepareAdditionalHeaders(
	MessageModifierInfo outgoingMessageInfo
)

Public Overridable Function PrepareAdditionalHeaders ( 
	outgoingMessageInfo As MessageModifierInfo
) As IEnumerable(Of PreparedExtensionHeader)

public:
virtual IEnumerable<PreparedExtensionHeader^>^ PrepareAdditionalHeaders(
	MessageModifierInfo^ outgoingMessageInfo
)