Azure App Service is a PaaS offering and its components, including Azure VMs, storage, network connections, web frameworks, management and integration features, are actively secured and hardened. It has a basic level of DDoS protection.
However, this basic layer of protection can be limited when facing large-scale attacks.
Azure App Service provides a unique default FQDN for every App Service App like myapp.azurewebsites.net. However, we can also map our own domain to App Service App. Custom domain mapping feature is only supported by paid plans, while custom TLS/SSL binding is only supported by Plans higher than Basic. For more information about App Service Plan, see App Service Pricing.
Azure Functions is an event-driven platform as a service provided by Microsoft Azure with which developers can focus less on infrastructure level complexity. Function app running on a consumption plan or an elastic plan will be charged per execution.
Some of you may have observed that your old blobs in a blob container re-triggered your blob function app even if you didn't modify them which caused extra cost, especially when your Azure function is connected to some other cost-intensive services.
In this blog, let's discuss the possible reasons for this blob function app anomaly.