Policies protect resources by binding together rules, users, and responses. Rules are the parts of policies that determine precisely which resources are protected, and which types of actions cause a rule to fire.
For example, a rule can specify all HTML files in a realm are protected for a GET action, which a Web server uses to respond to a request for an HTML page. When a user's browser attempts to access the resource, the rule fires and the policy containing the rule determines whether or not the user can view the selected resource.
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