299 Miscellaneous Persistent Warning
HTTP Warning code 299 Miscellaneous Persistent Warning is used in combination with the Warning header and included with HTTP responses to present information to the client for display or logging. This is similar to warning code 199 but 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: March 11, 2026