Understanding Azure Front Door (Features, Architecture and Uses)

Azure Front Door is a global, application-layer (Layer 7) load balancing and content delivery service that routes user traffic to the closest and healthiest backend across Microsoft's global network.

Key Features

• Global load balancing across multiple regions and backends
• SSL offloading to reduce processing load on backend servers
• Web Application Firewall (WAF) integration for security at the edge
• URL-based routing to send different paths to different backend services
• Caching of static content at edge locations for faster delivery

Architecture Overview

Front Door sits at the edge of Microsoft's global network. User requests hit the nearest Front Door point-of-presence first, which then routes the request to the best-performing healthy backend — whether that backend is in Azure, another cloud, or on-premises.

Common Use Cases

• Running a multi-region web application with automatic failover
• Protecting APIs and websites with a built-in WAF at the network edge
• Speeding up global content delivery with edge caching
• Splitting traffic across microservices using path-based routing