What I'm planning is to redirect example.com into test.example.com. (that should not be A record - the requirement was the change of the domain so the fact that it is in test domain is apparent.)
However, I found out that APEX domains cannot be CNAME record(link), so I thought redirection on CloudFront or beyond(nginx, expressjs) is appropriate, thereby I set two A records from example.com and beta.example.com to CF DNS name.
However with Cached CF I think there might be problem related to redirection.
For example, when a user tries to connect to example.com as a first hit(CF Cache miss), that request is passed into express and will be responded with 302 redirect to test.example.com.
However, when another user tries to connect to test.example.com, the request will be sent to CloudFront as request of /, so CF will return 302 redirect instead of passing it to express which makes no sence.
How can I solve this issue? Do I have to ditch caching for / resource or is there another way around it?
Solved by changing Behavior > Edit > Cache Based on Selected Request Headers to whitelist, and then adding Host header to whitelist.