Azure Application Gateway is a web traffic load balancer that enables you to manage traffic to your web applications. This service is used to distribute traffic to web applications residing on VMs, VM scale sets or event on-prem servers.
Features of the Azure Application Gateway Service
Secure Sockets Layer (SSL/TLS) termination, allows requests to the backend pools to go un-encrypted reducing the burden on backend pools.
On demand auto scaling to ensure better availability of the gateway service
Web application firewall that provides protection of your web applications against common exploits and attacks from the Internet.
Zone redundancy offering better fault resiliency and removing the need to provision separate Application Gateways in each zone.
URL Path Based Routing allows you to route traffic to back-end server pools based on URL Paths of the request
Multiple-site hosting enables configuring more than one web site on the same application gateway instance
Cookie-based session affinity to keep a user session on the same server.
Custom error pages
Re-writing HTTP headers
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