Azure Serverless Computing Cookbook - Second Edition

Configuring one host key for all the functions in a single function app

Having different keys for different functions is good practice when you have a handful of functions being used by a few applications. However, things might get worse if you have many functions and many client applications leveraging your APIs. Managing the function keys in these large enterprise applications with huge client bases would be painful. To make things simple, you can segregate all related functions into a single function app and configure the authorization for each function app instead of for each individual function. You can configure the authorization for a function app using host keys.

Here are the two different types of host keys that are available: