Complete HTTP Streams Transport Implementation

[aatchison]

🚀 Complete HTTP Streams Transport Implementation

This PR completes the HTTP Streams transport implementation that was documented in v1.1.0 but never fully committed to the repository.

✨ What's New

🔧 HTTP Streams Transport (/mcp endpoint)

• Full MCP Protocol Compliance: Complete implementation of HTTP Streams transport as per MCP specification
• Session Management: Secure session-based communication with UUID session IDs
• Bidirectional Communication: POST for client→server, SSE for server→client responses
• Health Endpoint: /health endpoint for service monitoring
• CORS Support: Full CORS headers for web client compatibility
• Security: ReadHeaderTimeout configuration, proper error handling

🧪 Comprehensive Testing Infrastructure

• 42 Unit Tests: All passing with race detection
• 3 Integration Test Scripts: Complete end-to-end testing for all transports
  • test_stdio_integration.py - STDIO transport testing
  • test_sse_integration.py - SSE transport testing
  • test_http_streams_integration.py - HTTP Streams transport testing
• Parallel Testing: GitHub Actions matrix strategy for concurrent transport testing
• Make Targets: Individual and combined test targets for all transports

🔄 CI/CD Enhancements

• GitHub Actions Workflow: Matrix strategy testing all three transports in parallel
• Python Dependencies: Proper requests package configuration
• Go 1.21+ Support: Updated build requirements
• Linting Integration: golangci-lint with comprehensive checks

🏗️ Architecture

HTTP Streams Transport Flow:

1. Initialize: POST /mcp with MCP initialize message → Returns session ID
2. SSE Stream: GET /mcp with session ID → Establishes server→client stream
3. Messages: POST /mcp with session ID → Responses via SSE stream
4. Health: GET /health → Service status monitoring

Session Management:

• Cryptographically secure UUID session IDs
• Thread-safe session storage with mutex protection
• Automatic cleanup on client disconnect
• Session validation for all requests

🧹 Code Quality Improvements

Major Refactoring:

• Reduced Complexity: Broke down complex functions into smaller helpers
  • handleMessage → 7 helper functions
  • handleSSEStream → 4 helper functions
• Error Handling: Comprehensive error checking for all operations
• Security: Added HTTP server timeouts, proper CORS handling
• Formatting: Applied gofmt to all files
• Linting: Fixed all golangci-lint issues (line length, error messages, style)

🧪 Test Results

✅ All Tests Passing:

Unit Tests: 42/42 PASSING
Integration Tests: 3/3 PASSING
- STDIO Transport: ✅ WORKING
- SSE Transport: ✅ WORKING  
- HTTP Streams Transport: ✅ WORKING
Build: ✅ PASSING
Lint: ✅ PASSING (0 issues)

📋 Transport Comparison

Feature	STDIO	SSE	HTTP Streams
Use Case	CLI tools	Web apps	Web apps
Communication	Bidirectional	Bidirectional	Bidirectional
Client→Server	stdin	POST /message	POST /mcp
Server→Client	stdout	SSE /sse	SSE /mcp
Session Management	Process-based	Session ID	Session ID
CORS Support	N/A	✅	✅
Health Check	N/A	/health	/health

🔧 Usage Examples

HTTP Streams Transport:

# Start server
./mcp-server -transport=http-streams -addr=8080

# Test with integration script
python3 scripts/test_http_streams_integration.py 8080

# Manual testing
curl -X POST http://localhost:8080/mcp \
  -H "Content-Type: application/json" \
  -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0.0"}}}'

All Transports Testing:

make test-integration-all  # Test all transports
make test-integration-stdio
make test-integration-sse  
make test-integration-http-streams

🚨 Quality Control Note

This PR addresses the critical quality control issue where HTTP Streams transport was documented in v1.1.0 release notes but the implementation was never committed. All three transports now have:

• Complete implementations
• Comprehensive test coverage
• Integration test scripts
• CI/CD validation

🎯 Breaking Changes

None - This is purely additive functionality. All existing STDIO and SSE transport functionality remains unchanged and fully backward compatible.

📚 Documentation

• Updated README with HTTP Streams transport usage
• Added comprehensive integration test scripts
• Enhanced Makefile with new test targets
• GitHub Actions workflow documentation

---

Ready for Review ✅

• All tests passing
• No linting issues
• Complete documentation
• Backward compatible
• Production ready

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