Header name | Description |
---|---|
Retry-After | The Retry-After header field can be used with "502 Service Unavailable" to indicate how long the service is expected to be unavailable |
WWW-Authenticate | Must be included with a "401 Unauthorized" response, like this: <header name=WWW-Authenticate value="Basic; Realm=any">. The realm attribute is required for all access authentication schemes which issue a challenge. The realm value, in combination with the root URL of the server being accessed, will be presented to the user. |
Location | Must be included with a redirect of any kind, like this: <header name=Location value=URL>. |
Content-Language | The language of the document |
Content-Encoding | The encoding of the document |
Content-Type | The content type, usually text/html. |
Derived-From | Indicates which document this document is derived from |
Expires | After the date indicated by this header, the document must be refetched from the server |