Options for configuring the StaticPlugin.
Index file to serve when a directory is requested (default: 'index.html'). Set to empty string '' to disable index resolution.
Fallback file to serve for missing paths when Accept includes text/html (default: undefined). Used for SPA fallback.
Cache-Control header configuration (default: function returning immutable for hashed assets, must-revalidate for others).
- A string is used verbatim for all responses.
- A function is called per request with the root-relative path.