The value is the URL that corresponds to the generic URL of which this object is a variant. This refers to those resources that have moved to a new URL, or that have multiple possible URLs for the same resource. Expires give the date at which the redirection information expires. Finally, Location indicates the URL to which the user-agent should be redirected. Expires Gives the expiry date for the relocation.
Location Gives the location of the redirected object.
The date at which the redirection was first put in place. The authentication scheme to use when accessing the object. The date at which the object was deleted, or at which authentication access control was implemented. Database A database of this type can be generated by simple traversal of the document directory tree, and by applying rules extracted from server configuration files and from the robots.txt file. In any event, an indexing engine will probably have a faster database engine than the server, so that it might be more efficient to download the entire extracted archive of information, than to actually implement the querying interface on the server.