如何重构以接受多个客户端?

我不明白为什么server.py版本1允许客户端被键盘中断并重新启动,而server.py版本2不:

server.py版本1:

import asyncio

async def handle_client(reader, writer):
    while True:
        request = (await reader.read(128)).decode()
        writer.write('Received ok.'.encode())
        await writer.drain()

async def main():
    loop.create_task(asyncio.start_server(handle_client, 'localhost', 15555))

loop = asyncio.new_event_loop()
loop.create_task(main())
loop.run_forever()

server.py版本2:

import asyncio

async def handle_client(reader, writer):
    while True:
        request = (await reader.read(128)).decode()
        if request == "hello":
            writer.write('Received ok.'.encode())
            await writer.drain()

async def main():
    loop.create_task(asyncio.start_server(handle_client, 'localhost', 15555))

loop = asyncio.new_event_loop()
loop.create_task(main())
loop.run_forever()

客户:

import asyncio

async def make_connections():
    reader, writer = await asyncio.open_connection('localhost', 15555, loop=loop)
    loop.create_task(connect(reader, writer))


async def connect(reader, writer):
    writer.write("hello".encode())
    await writer.drain()
    result = await reader.read(128)
    print(result.decode())


loop = asyncio.new_event_loop()
loop.create_task(make_connections())
loop.run_forever()

版本2对单个客户机运行良好,但如果我向客户机发送键盘中断,则在重新启动客户机后将无法再连接。每次在客户机中修改代码时,ssh和终止/重新启动服务器都很烦人。我不明白为什么第二个版本在客户端第二次尝试连接时不接受它。