Get Current Domain In next.config.js

[pihish]

Summary

I have a site that is accessible via both a top level domain through a folder path (ie. https://customdomain.com/mysite) and via a subdomain (ie. https://mysitehost.customdomain.com/). The top level domain reverse proxies requests that it receives to https://mysitehost.customdomain.com/.

I currently have my basePath, assetsStaticBasePath, and assetPrefix values in next.config.js set so that my static assets (ie. images) load when the site is accessed via https://customdomain.com/mysite. Static assets fail to load if the user visits https://mysitehost.customdomain.com/ directly.

I would like static assets to load properly via both entry points. To do this, I need to get the current domain in next.config.js.

Is there a way to do this?

Additional information

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Example

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