This adds support for the `X-Forwaded-Prefix` that rewires the paths using a custom base, with a default of `/ngclient`. This allows using ngclient behind a proxy. This fixes #6278
This adds support for the `X-Forwaded-Prefix` that rewires the paths using a custom base, with a default of `/ngclient`. This allows using ngclient behind a proxy. This fixes #6278