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Liam Moat

Principal Software Engineer at Microsoft

Front Door

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Reduce egress with Azure Front Door health probes

By Liam Moat.

Azure Front Door is a scalable and secure entry point for fast delivery of your global web applications. Front Door periodically sends a synthetic HTTP/HTTPS request to all your configured origins to determine health and proximity. Since multiple global locations are each sending health probes to your origins, the volume of traffic and ’egress’ can be quite high. In this post, I will explain why this is important and how you can reduce egress costs using HEAD requests.