Potential bug: Starlette proxy duplicates request URL

[samringer]

I'm writing a simple HTTP proxy using Starlette.
The incoming urls seem to be duplicated?

For example, running http_proxy=localhost:8000 curl www.example.com against the following code prints http://www.example.comhttp://www.example.com/ to stdout.

from starlette.applications import Starlette
from hypercorn.trio import serve
from hypercorn.config import Config
import trio

async def main():
    
    async def my_callback(x, y):
        print(x.url)

    app = Starlette(exception_handlers={404: my_callback})
    await serve(app=app, config=Config())


trio.run(main)

Am I doing something wrong or is this a bug?