[英]python asyncio connection gets incomplete http response
I was trying to get the content of website with python asyncio. 我正在尝试使用python asyncio获取网站的内容。
import asyncio
import urllib.parse
@asyncio.coroutine
def get(url):
url = urllib.parse.urlsplit(url)
connect = asyncio.open_connection(url.hostname, 80)
reader, writer = yield from connect
request = ('HEAD {path} HTTP/1.1\r\n'
'Host: {hostname}\r\n'
'Accept:*/*\r\n'
'\r\n').format(path=url.path or '/', hostname=url.hostname)
writer.write(request.encode('latin-1'))
response = yield from reader.read()
print(response)
writer.close()
url = 'http://www.example.com'
loop = asyncio.get_event_loop()
tasks = asyncio.ensure_future(get(url))
loop.run_until_complete(tasks)
loop.close()
It gets only the header, but no content! 它仅获得标题,而没有内容!
b'HTTP/1.1 200 OK\r\nAccept-Ranges: bytes\r\nCache-Control: max-age=604800\r\nContent-Type: text/html\r\nDate: Sat, 25 Feb 2017 11:44:26 GMT\r\nEtag: "359670651+ident"\r\nExpires: Sat, 04 Mar 2017 11:44:26 GMT\r\nLast-Modified: Fri, 09 Aug 2013 23:54:35 GMT\r\nServer: ECS (rhv/818F)\r\nX-Cache: HIT\r\nContent-Length: 1270\r\n\r\n'
As stated by one of the comments, you are performing a HEAD request instead of a GET request: a HEAD request will only retrieve the headers, that's why you are only receiving those. 正如其中一条注释所述,您正在执行HEAD请求而不是GET请求:HEAD请求将仅检索标头,这就是为什么仅接收标头的原因。
I've tested your code with GET instead of HEAD, and it works as you were expecting; 我已经用GET而不是HEAD测试了您的代码,它可以按您期望的那样工作; but as an advice, I'd be moving to aiohttp, your entire code would be comprised into the one below, not only nicer looking, but also way faster:
但作为建议,我将转向aiohttp,您的整个代码将包含在下面的代码中,不仅看起来更漂亮,而且速度更快:
import asyncio
import aiohttp
async def get(loop, url):
async with aiohttp.request('GET', url, encoding='latin-1') as response:
html = await response.text()
print(html)
url = 'http://www.example.com'
loop = asyncio.get_event_loop()
loop.run_until_complete(get(loop, url))
loop.close()
NOTE: This is Python 3.5+ async/await style, but it can be easily translated into 3.4 with @asyncio.coroutine and yield from. 注意:这是Python 3.5+ async / await样式,但是可以使用@ asyncio.coroutine和yield from轻松地转换为3.4。 Let me know if you have any issue doing it.
让我知道您是否有任何问题。
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