Mounting marimo to generic ASGI app (not FastAPI)

[liquidcarbon]

Been playing with Granian, thought I'd share minimal example of mounting marimo apps to a Granian server

from marimo import create_asgi_app



mo_app = (
    create_asgi_app(include_code=True).with_app(path="/mo", root="nb/marimo_notebook.py")
).build()

async def app(scope, receive, send):

    if scope["type"] == "lifespan":
        return await mo_app(scope, receive, send)

    if scope["type"] == "websocket":
        return await mo_app(scope, receive, send)
    
    path = scope.get("path")
    if path.startswith("/mo"):
        # hand off to Marimo ASGI app
        return await mo_app(scope, receive, send)

    # otherwise: go to default handler
    return await default_app(scope, receive, send)

# --- regular small ASGI endpoint ---
async def default_app(scope, receive, send):
    assert scope["type"] == "http"
    await send({
        "type": "http.response.start",
        "status": 200,
        "headers": [(b"content-type", b"text/plain")],
    })
    await send({
        "type": "http.response.body",
        "body": b"Hello, world!",
    })

Not sure what this accomplishes but if someone really wants to replace to avoid fastapi/uvicorn - here's an option.