Use host and proto headers to determine request origin if AUTH_URL is not set #12421
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☕️ Reasoning
The v5 docs state that
AUTH_URL"is mostly unnecessary with v5 as the host is inferred from the request headers," but this is only the case in some areas of@auth/core, and theurlof the request is often the fallback for determining URLs in the framework. But in the case that the app is running behind a reverse proxy or in a number of other networking setups, requests to@auth/corefromnext-authwon't have a relevant url (0.0.0.0observed in our use case) and authentication will fail in a number of ways withoutAUTH_URLset.This change checks request headers (if they're set) to determine the url to send to
@auth/core, in the case thatAUTH_URLorNEXTAUTH_URLare not set. This properly cuts reliance onAUTH_URL(in our use case) and also as a bonus enables multiple authentication urls to be used in a given system.Possibly this behavior should be behind some config if we want to make it opt in. If so I'm happy to add that.
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