The name the message is intended for.
The name of the error that occurred.
The interface name.
Not a valid header field.
The method or signal name.
The number of UNIX file descriptors that accompany the message.
The object path.
The serial number the message is a reply to.
Unique name of the sender of the message (filled in by the bus).
The signature of the message body.
Header fields used in #GDBusMessage.