ASP.NET Core Web Development on .NET Core 8 — Lesson 3: RESTful APIs, Client Integration, and Testing

Learning Objectives

• Design RESTful endpoints, status codes, contracts, versioning, and documentation
• Integrate clients and handle serialization, errors, authentication, and CORS
• Write unit, integration, and API tests for critical behavior

Guided Demonstration

1. Review the requirement, environment, dependencies, roles, risks, and expected result.
2. Demonstrate the relevant configuration, development, analysis, or support workflow.
3. Capture settings, outputs, logs, screenshots, code, or test evidence.
4. Compare the observed result with the acceptance criteria and identify gaps.

Hands-On Activity

Build and test a REST API with controlled client access.

• Document assumptions and the planned sequence before making changes.
• Complete the activity and preserve evidence of normal and exception behavior.
• Record issues, corrective actions, and reusable operational or development notes.

Troubleshooting Focus

• Separate symptoms from causes and collect evidence before applying a fix.
• Check configuration, permissions, data, dependencies, capacity, connectivity, and recent changes.
• Validate rollback, recovery, support ownership, and user or business impact.

Validation Checklist

• The requirement and expected result are clear.
• The selected configuration, design, query, code, or process is documented.
• Normal, boundary, failure, security, and operational conditions are reviewed.
• The result is supported by evidence and the next improvement is prioritized.

Lesson Outcome

Learners can explain and apply RESTful APIs, Client Integration, and Testing in a realistic scenario and support the result with documented evidence.