What Is Application Gateway?

• Application layer (OSI layer 7) load balancer and reverse proxy
• An application delivery controller (ADC) as a service
• Application gateway is a type of firewall that provides application-level control over network traffic
• It is responsible for filtering incoming traffic that contains network application data
• Application gateway is a program that serves as a firewall proxy
• Application gateway usually runs between internet and a private a network to tighten security
• Application Gateway can make routing decisions based on additional attributes of an HTTP request (i.e. URI path or host header)

Azure Application Gateway?

• Azure Application Gateway is a web traffic load balancer that enables to manage traffic to web applications
• A managed layer 7 load-balancing solution (traditional load balancers operate at layer 4)
• Platform-managed, scalable application delivery controller (ADC) as a service

Why To Use Azure Application Gateway?

• Integrated web application firewall (WAF)
• Centralized SSL offload and SSL policy
• End-to-end SSL
• Highly available (SLA 99.95%)
• Support for public, private, and hybrid websites
• Support for cookie-based session affinity