299 Miscellaneous Persistent Warning
The HTTP 299 Miscellaneous Persistent Warning code carries arbitrary warning text in the Warning header. Similar to warning code 199, the information is intended for client-side display or logging, but this variant specifies the warning is persistent.
Note
The warning code 299 Miscellaneous Persistent Warning and the Warning header have been obsoleted.
Example
Warning: 299 www.example.re "Random persistent message"
See also
Last updated: April 4, 2026