Blue Coat Systems Proxy SG manual Preface Introducing the Content Policy Language

Preface: Introducing the Content Policy Language

The Content Policy Language (CPL) is a powerful, flexible language that enables you to specify a variety of Web-access policies. ProxySG policy is written in CPL, and every Web request is evaluated based on the installed policy. The language is designed so that policies can be customized to an organization’s specific set of users and unique enforcement needs.

CPL uses the settings created when you configured the ProxySG to your specifications.

CPL has the following capabilities:

•Fine-grained control over various aspects of ProxySG behavior.

•Layered policy, allowing for multiple policy decisions for each request.

•Multiple actions triggered by a particular condition.

•Flexibility of user-defined conditions and actions.

•Convenience of predefined common actions and transformations.

•Authentication-aware policy, including user and group configuration.

•Support for multiple authentication realms.

•Configurable policy event logging.

•Built-in debugging.

About the Document Organization

This document is organized for easy reference, and is divided into the following sections and chapters:

Table 2.1: Manual Organization

Chapter 1 – Overview of Content Policy		This chapter provides an overview of CPL, including concepts, CPL
Language		basics, writing and troubleshooting policy and upgrade/downgrade
		issues.
Chapter 2 – Managing CPL		Building upon Chapter 1, this chapter discusses understanding
		transactions, timing, layers, and sections, defining policies, and best
		practices.
Chapter 3	– Conditions	This reference guide contains the list of conditions that are supported
		by CPL and provides an explanation for the usage.
Chapter 4	– Properties	This reference guide contains the list of properties that are supported
		by CPL and provides an explanation for the usage.
Chapter 5	– Actions	This reference guide contains the list of actions that are supported by
		CPL and provides an explanation for the usage.
Chapter 6	– Definitions	This reference guide contains the list of definitions that are
		supported by CPL and provides an explanation for the usage.
Appendix A – Glossary		Terms used in this manual are defined in this appendix.
Appendix B – Troubleshooting		Using policy trace properties is explained in this appendix.
Appendix C – Recognized HTTP Headers		This appendix lists all recognized HTTP 1.1 headers and
		indicates how the ProxySG interacts with them.