Section 4: Action Controller & Routing: Request Pipelines, Content Negotiation & REST

📄 Section Lessons

• Lesson 1: 4.1 Request Orchestration: Action Controller & Strong Parameters

  Official Guide: Action Controller Overview. Deep dive into controller request dispatch, Strong Parameters, filters, session and cookie security, flash alerts, and HTTP health checks.

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• Lesson 2: 4.2 Content Negotiation: Multi-Format APIs & File Streaming

  Official Guide: Action Controller Advanced Topics. Master high-performance file downloads with send_file, Bearer token authentication, live streaming with Server-Sent Events, and HTTP caching.

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• Lesson 3: 4.3 RESTful Resource Routing: The 7 Standard Actions & Route Helpers

  Official Guide: Rails Routing from the Outside In (Part 1). Master Rails routing architecture: the 7 standard RESTful actions, path and URL helpers, singular resources, controller namespaces, nested resources, shallow nesting, concerns, and member/collection routes.

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• Lesson 4: 4.4 Advanced Routing Architecture: Constraints, Globbing, Rack Mounts & Route Customization

  Official Guide: Rails Routing from the Outside In (Part 2). Advanced routing patterns: non-resourceful routes, dynamic and wildcard segment globbing, route constraints, mounting Rack applications, direct routes, resolve, route file decomposition, and route testing.

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