What is the ARRAffinitySameSite cookie for?
I'm calling an Azure app service app and found these two cookies:
I understand the ARRAffinity cookie is to make sure the request is always sent back to the same backend instance, but what is the ARRAffinitySameSite cookie for?
Solution
The purpose of ARRAffinitySameSite and ARRAffinity cookies is the same - they help to direct requests to the correct instance in load-balanced environments.
The only difference between them is the SameSite attribute. ARRAffinitySameSite was introduced when Chromium-based browsers enforced the new SameSite policy in 2020.
However, some old browsers do not support the SameSite attribute and Azure keeps the cookie ARRAffinity for backward compatibility.
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