Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Warning HTTP header contains information about possible problems with the status of the message. More than one
Warning header may appear in a response.
Warning header fields can, in general, be applied to any message. However, some warn-codes are specific to caches and can only be applied to response messages.
|Header type||Request header, Response header|
|Forbidden header name||no|