#适用于3.5版本以上

import asyncio

async def wget(host):

    print('wget %s ... ' % host)

    connect = asyncio.open_connection(host, 80)

    reader, writer = await connect

    header = 'GET / HTTP/1.0\r\nHost:%s\r\n\r\n' % host

    writer.write(header.encode('utf-8'))

    await writer.drain()

    while True:

        line = await reader.readline()

        if line == b'\r\n':

            break

        print('%s header>%s' % (host,line.decode('utf-8').rstrip()))

    writer.close()   #Ignore the body, close the socket

loop = asyncio.get_event_loop()

tasks = [wget(host) for host in ['www.sina.com.cn', 'www.sohu.com', 'www.163.com']]

loop.run_until_complete(asyncio.wait(tasks))

loop.close()