Distinct Logic Authority

• Explain that each operational state of the application should have one clear entry point.
• Explain why URLs should represent meaningful application state.
• Explain how Hypermedia applications (plain HTML over HTTP) promote higer quality code.

Traceability

• Immediately obvious which line of code is the entry point to the logic.
• Improves traceability.
• Avoids duplicated behaviour spread across the system.
• Keeps request handling comprehensible.

Relationship to WebEngine

• Connect the idea to file-based routing and thin page logic.
• Show how distinct URLs and distinct logic reinforce each other.
• Example: debug why a button isn't working - page is on a URL, easily find the page logic, find the function from the button value.
• Example: any redirects are explained in X-Location-Sent-From header.
• Example: any go or do functions are explained in X-Logic-Execution header.

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Next, read SPA vs MPA.