Azure Front Door is a service which provides global load balancing with Dynamic Website Acceleration (DSA). This service can work on layer 7 that is why if we use Azure Front Door in our application, we will get layer 7 capabilities such as SSL offload, path-based routing, failover etc. to improve performance and high-availability of our applications. We can manage, and monitor global routing for web traffic with high availability.

Advantages:

• We can configure Azure front door in two ways, first one is, Azure front door that have normal functions, and the second one, Azure front door standard/Premium which is integrate with DevOps, support analytics, and a high level of security.
• It supports Sticky Session
• It supports web application firewall (WAF).
• Supports Azure DDOS protection

Front Door traffic routing methods:

• Latency: It confirm that requests are sent to the lowest latency back ends acceptable in respect to network latency.
• Priority: It helps to assign priorities for our back ends when primary backend becomes unavailable the secondary backend can be a backup.
• Weighted: It ensure when you want to distribute traffic across a set of endpoints according to weights as you define.
• Session Affinity: It ensure requests from the same user gets the same backend.