Traffic Policy Engine - What are CEL variables?

Ngrok's Traffic Policy Module has been introduced to streamline configuration across various platforms, including cloud, API, SDKs, and Kubernetes. The module utilizes Common Expression Language (CEL) variables, which are designed for safety, performance, and ease of integration, to enhance policy evaluation, rule enforcement, and data transformation. Consistency in variable naming is emphasized to ensure uniformity across the Traffic Policy Engine, enabling users to create dynamic traffic filtering rules. CEL variables, which contain information from incoming connections like requests and responses, are crucial for adapting Traffic Policy rules to different conditions, thereby increasing document flexibility and responsiveness. Practical examples demonstrate how CEL variables, such as request method and content type, can be used to filter traffic effectively, offering users more control over their Traffic Policy documents. This functionality allows for better management of traffic to applications and APIs, promoting efficiency and effectiveness in traffic handling.

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