# Request Pipeline

URL: /chirp/docs/build-apps/request-pipeline/
Section: request-pipeline
Tags: middleware, pipeline, protocol, requests

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Use this section when behavior belongs around route handlers rather than inside them: security headers, sessions, CSRF, static files, CORS, auth, and custom pipeline logic. Overview Protocol definition and pipeline execution How middleware works -- no base class, no inheritance. Package Built-in Middleware CORS, StaticFiles, Sessions, Auth, CSRF Middleware that ships with Chirp. Code Custom Middleware Writing your own middleware Functions, classes, and real-world patterns. RenderPlan Middleware Inspect rendering decisions from middleware Read-only access to the frozen RenderPlan for analytics, caching, and debugging.

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