Middleware Deep Dive

Master custom middleware creation and advanced patterns
Time: 45-60 minutes • Level: Advanced • Prerequisites: Essentials - Middleware

🎯 What You’ll Learn

• Custom middleware creation patterns
• Middleware composition strategies
• Context manipulation techniques
• Error recovery patterns
• Performance impact analysis
• Third-party middleware integration

📚 Topics

1. Custom Middleware Creation

Build production-ready middleware:

• Middleware signature patterns
• Context handling
• Error propagation
• Response manipulation

2. Middleware Composition

Combine middleware effectively:

• Chaining strategies
• Conditional middleware
• Dynamic middleware loading
• Order of execution

3. Context Manipulation

Work with request context:

• Storing request-scoped data
• Context propagation
• Thread safety
• Context cleanup

4. Error Recovery

Handle errors gracefully:

• Panic recovery
• Error transformation
• Error logging
• Graceful degradation

5. Performance Considerations

Optimize middleware:

• Overhead analysis
• Caching strategies
• Skip patterns
• Benchmarking

6. Integration Patterns

Integrate third-party middleware:

• Adapter patterns
• Compatibility layers
• Migration strategies

📂 Examples

All examples are in the examples/ folder:

01 - Custom Middleware

Build production-ready custom middleware.

02 - Composition

Advanced middleware composition patterns.

03 - Context Management

Repository and retrieve request-scoped data.

04 - Error Recovery

Panic recovery and error handling.

05 - Performance

Benchmark and optimize middleware.

06 - Integration

Integrate third-party middleware.

🚀 Quick Start

# Run any example
cd docs/02-deep-dive/03-middleware/examples/01-custom-middleware
go run main.go

# Test with provided test.http

📖 Prerequisites

Before diving in, make sure you understand:

• Middleware basics
• Built-in middleware
• Request context

🎯 Learning Path

1. Create custom middleware → Build reusable components
2. Compose middleware → Chain effectively
3. Manage context → Repository request data
4. Handle errors → Recover gracefully
5. Optimize → Minimize overhead
6. Integrate → Use third-party middleware

💡 Key Takeaways

After completing this section:

• ✅ You’ll build production-ready middleware
• ✅ You’ll compose middleware effectively
• ✅ You’ll manage request context safely
• ✅ You’ll handle errors gracefully
• ✅ You’ll optimize middleware performance
• ✅ You’ll integrate third-party solutions

Coming Soon - Examples and detailed content are being prepared.

Next: Configuration Deep Dive →