Azure Application Gateway Overview

Azure Application Gateway (AppGW) is a web traffic load balancing service that enables users to build, deploy, and scale web applications in the cloud. It provides features such as layer 7 load balancing, SSL termination, session draining and cookie-based session affinity, to help organizations improve the performance, reliability, and security of their web applications.

Often AppGW is combined with Web Application Firewall (WAF) to secure http/https traffic.

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One of the key benefits of using Azure Application Gateway is its ability to distribute incoming traffic across multiple servers or instances of a web application. This can help to improve the performance of the application by reducing the load on any single server or instance, and also increase its availability by allowing it to continue running even if one or more servers or instances become unavailable.

To learn about Application Gateway features, see Azure Application Gateway features.

To use Azure Application Gateway, users first need to create a gateway instance and configure it with the desired settings, such as the number of servers or instances to load balance across, the load balancing algorithm to use, and the type of traffic to load balance (e.g., HTTP, HTTPS). They can then create one or more rules that specify the incoming traffic to load balance, as well as the servers or instances to distribute it to.

To learn about Application Gateway infrastructure, see Azure Application Gateway infrastructure configuration.

Azure Application Gateway also includes features for improving the security of web applications. For example, it supports SSL termination, which allows users to terminate SSL connections at the gateway and communicate with the backend servers or instances over unencrypted connections. This can reduce the load on the backend servers or instances, as well as simplify the SSL certificate management process.

Overview of SSL termination and end to end SSL with Application Gateway

In addition, Azure Application Gateway supports cookie-based session affinity, which enables users to direct incoming traffic from a specific client to the same backend server or instance for the duration of the client’s session. This can help to improve the performance of the application by allowing it to take advantage of server-side caching and other optimizations that rely on maintaining a persistent connection with a client.

Another benefit of Azure Application Gateway is its integration with other Azure services. For example, users can use it in conjunction with Azure Traffic Manager to load balance traffic across multiple regions or clouds, or with Azure Load Balancer to load balance traffic at the network layer. This can help users to build highly available and scalable web applications that can withstand failures or outages in any single region or cloud.

Overall, Azure Application Gateway is a powerful and flexible service that enables users to build, deploy, and scale web applications in the cloud. Its load balancing, SSL termination, and session affinity features can help to improve the performance, reliability, and security of these applications, and its integration with other Azure services allows users to build highly available and scalable solutions.

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