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Summary

This PR implements Incremental Static Regeneration (ISR) for property detail pages to address issue #136. The implementation significantly improves performance by caching property pages while ensuring data freshness through automatic and on-demand revalidation.

🚀 Performance Improvements

  • 60-second revalidation for property pages with ISR
  • Background revalidation ensures fresh content
  • CDN optimization with proper cache headers
  • Reduced server load through intelligent caching
  • Faster page loads for cached properties

🔧 Implementation Details

Server-Side Rendering with ISR

  • Converted property detail pages from client to server components
  • Added export const revalidate = 60 for 60-second revalidation
  • Implemented async data fetching on server side

Component Architecture

  • PropertyDetailServer: Static content rendering (server component)
  • PropertyDetailClient: Interactive elements (client component)
  • Clean separation of server/client responsibilities

On-Demand Revalidation

  • Secure webhook endpoint: /api/revalidate
  • HMAC-SHA256 signature verification for security
  • Support for single property and bulk revalidation
  • Comprehensive logging and error handling

Fallback Pages

  • Custom 404 page for missing properties
  • Helpful messaging for new properties
  • Professional error handling with navigation options

CDN Optimization

  • Optimized cache headers for property pages
  • stale-while-revalidate strategy
  • Proper CDN caching configuration

📁 Files Changed

  • src/app/properties/[id]/page.tsx - Converted to ISR server component
  • src/components/PropertyDetailServer.tsx - Server-side property content
  • src/components/PropertyDetailClient.tsx - Client-side interactive elements
  • src/app/api/revalidate/route.ts - Webhook endpoint for revalidation
  • src/app/properties/[id]/not-found.tsx - Custom 404 page
  • src/lib/propertyServiceServer.ts - Server-side data fetching utilities
  • next.config.ts - Added CDN cache headers
  • ISR_IMPLEMENTATION.md - Comprehensive documentation

🔒 Security Features

  • Webhook signature verification with HMAC-SHA256
  • Environment variable for webhook secret
  • Proper request validation and error handling
  • Secure cache headers for authenticated routes

📊 Cache Strategy

  • Browser cache: 1 minute (max-age=60)
  • Stale content: 5 minutes while revalidating (stale-while-revalidate=300)
  • CDN cache: 5 minutes (s-maxage=300)

🧪 Testing

The implementation includes:

  • Comprehensive error handling
  • Fallback pages for missing properties
  • Webhook health check endpoint
  • Proper TypeScript interfaces

📚 Documentation

Complete implementation documentation is available in ISR_IMPLEMENTATION.md including:

  • Usage examples
  • Security considerations
  • Deployment instructions
  • Troubleshooting guide

🔗 Webhook Usage

# Revalidate single property
curl -X POST https://your-domain.com/api/revalidate \
  -H "Content-Type: application/json" \
  -H "x-webhook-signature: <signature>" \
  -d '{
    "type": "property",
    "propertyId": "property-123",
    "reason": "Property updated"
  }'

🚦 Ready for Review

This implementation follows Next.js best practices and includes proper error handling, security measures, and monitoring capabilities. The code is ready for testing and deployment.

Fixes #136