Azure Application Gateway - jasper-zanjani/azure GitHub Wiki

Azure Application Gateway is used to load balance a large-scale set using more than 100 instances in place of Azure Load Balancer. AZ-103: p. 223

Application Gateway supports session affinity to save user state using browser cookies.

Unlike Azure Load Balancer, which operates at OSI layer 4 and has limited security capabilities, Application Gateway operates at OSI layer 7 and provides Web Application Firewall (WAF) functioanlity to block attacks like SQL injection, cross-site scripting, and header injection. HTTPS is also only available with layer 7 load balancers like Application Gateway.

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