How can uvicorn handle large requests at the same time without exception?

[magiskboy]

Recently, I built a simple http server. The request is handled asynchronously in following:

# implement httptools parser protocol
class HTTPProtocol:
    def on_message_complete(self):
        ...
        asyncio.create_task(self.handle(request))
        ...


http_protocol = HTTPProtocol()

server = asyncio.create_server(http_protocol, host, port)
server.serve_forever()

In handle function, I render the response data (bytes) and sent to client via

transport.write(data)
transport.drain()

I sent a curl request, it's work but I use wrk for benchmark with a single connection during a second and result:

For detail: https://github.com/magiskboy/zazu/blob/main/zazu/server.py

I have no idea for this!