I found How can I add a custom header to my error pages? , which showed me Plug.ErrorHandler — Plug v1.20.2 . The general advice is to keep error pages simple, independent of existing layouts, minimal dependencies, to avoid more errors when rendering the error page itself. How do you approach custom…

One approach is to have a plug that “loads” the tenant and sets the path to tenant-specific styling (e.g. CSS, values for tennnt name, etc.) This is pretty common in multi-tenant applications. Then use ErrorView[1] to implement custom error pages which use those values to customize the error pages. …

I’d explicitly handle all the error pages you expect to have custom branding on. Leave ErrorHandler to the truely exceptional case.

Elixir Programming Language Forum

Tenancy-aware custom error page

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rhcarvalho July 29, 2025, 6:37pm 4

Thanks for the replies!