INNER CODE UNIT · Python

_mount_spa

ohdearquant/lionagi · lionagi/studio/app.py:325

def _mount_spa(application: FastAPI, dist: Path) -> None:
    """Mount static assets and register an SPA 404 fallback. Uses a 404
    exception handler, not a catch-all route (which would intercept
    /api/shows before FastAPI's trailing-slash redirect fires).
    """
    assets_dir = dist / "assets"
    if assets_dir.is_dir():
        application.mount("/assets", StaticFiles(directory=str(assets_dir)), name="spa-assets")

    index_path = dist / "index.html"

    @application.exception_handler(404)
    async def _spa_fallback(request: Request, exc: Exception) -> FileResponse | JSONResponse:
        # /api/* paths stay 404 JSON here, not the SPA HTML shell.
        path = request.url.path
        if path.startswith("/api/") or path == "/api":
            return JSONResponse({"detail": "Not Found"}, status_code=404)
        if request.method not in ("GET", "HEAD"):

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