Possible to make subdomain only accessible through 'embed'

[Jore]

Hi there,

I have pages served from "embed.domain.com" that I'd only like to be 
accessible when they're embedded in files served from "docs.domain.com"

Visualisation below:

Is it possible to lock down "embed.domain.com" so it can only be 
accessed through "docs.domain.com"?

Can this be done with nginx conf or another method?

Thank you!
Jore



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