| Value | Meaning |
|---|---|
| Invalid0 | Not a valid header field. |
| Path1 | The object path. |
| Interface2 | The interface name. |
| Member3 | The method or signal name. |
| ErrorName4 | The name of the error that occurred. |
| ReplySerial5 | The serial number the message is a reply to. |
| Destination6 | The name the message is intended for. |
| Sender7 | Unique name of the sender of the message (filled in by the bus). |
| Signature8 | The signature of the message body. |
| NumUnixFds9 | The number of UNIX file descriptors that accompany the message. |
Header fields used in #GDBusMessage.