feat: add ui.path config option for serving UI/API behind a proxy#1034
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Summary
Adds a new
ui.pathconfiguration option that sets a base path prefix for all UI and API routes. This allows fabio's admin interface to be served behind a reverse proxy at a sub-path.Closes #323
Motivation
Currently all admin UI and API routes are hardcoded to the root path (
/). When fabio is placed behind a reverse proxy (or proxying itself) at a sub-path like/fabio, the UI breaks - it redirects to/routesinstead of/fabio/routes, and all asset/API paths fail.Usage
ui.path = /fabioThen the UI is accessible at http://localhost:9998/fabio/routes
When ui.path is not set, behavior is unchanged.