python - python 请求模块和 curl 的不同结果

Question

当使用 CURL 时，我得到了结果。这是一个 302 重定向。

hhr@hhr:~$ curl -I http://www.vevo.com/watch/kesha/crazy-kids/USRV81300226
HTTP/1.1 302 Moved Temporarily
Content-Length: 159
Content-Type: text/html; charset=utf-8
Location: http://www.youtube.com/watch?v=xdeFB7I0YH4
Server: Microsoft-IIS/7.0
X-AspNetMvc-Version: 3.0
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Access-Control-Allow-Origin: *
Expires: Mon, 17 Jun 2013 15:33:41 GMT
Cache-Control: max-age=0, no-cache, no-store
Pragma: no-cache
Date: Mon, 17 Jun 2013 15:33:41 GMT
Connection: keep-alive

使用Python requests模块时，结果如下。而且是 200 ok。

import requests
import pprint

url = 'http://www.vevo.com/watch/kesha/crazy-kids/USRV81300226'
res = requests.get(url, proxies={'http': '127.0.0.1:8087'}, allow_redirects=False)

print 'status_code: ', res.status_code
print 'response_url: ', res.url
print 'headers: '
pprint.pprint(res.headers)
print 'history: ', res.history

输出:

status_code:  200
response_url:  http://www.vevo.com/watch/kesha/crazy-kids/USRV81300226
headers: 
{'access-control-allow-origin': '*',
 'cache-control': 'max-age=0, no-cache, no-store',
 'connection': 'keep-alive',
 'content-encoding': 'deflate',
 'content-length': '12310',
 'content-type': 'text/html; charset=utf-8',
 'date': 'Mon, 17 Jun 2013 16:17:35 GMT',
 'expires': 'Mon, 17 Jun 2013 16:17:35 GMT',
 'pragma': 'no-cache',
 'server': 'Microsoft-IIS/7.0',
 'vary': 'Accept-Encoding',
 'via': 'HTTP/1.1 GWA',
 'x-aspnet-version': '4.0.30319',
 'x-aspnetmvc-version': '3.0',
 'x-powered-by': 'ASP.NET'}
history:  []

为什么结果不同？

我该怎么做才能使用 Python 在 CURL 输出中获取 Location: http://www.youtube.com/watch?v=xdeFB7I0YH4 值？

Answer 1

res = requests.get(url, allow_redirects=False)

没有 proxies=...，我得到以下输出。

status_code:  302
response_url:  http://www.vevo.com/watch/kesha/crazy-kids/USRV81300226
headers:
{'access-control-allow-origin': '*',
 'cache-control': 'max-age=0, no-cache, no-store',
 'connection': 'keep-alive',
 'content-length': '159',
 'content-type': 'text/html; charset=utf-8',
 'date': 'Mon, 17 Jun 2013 16:32:15 GMT',
 'expires': 'Mon, 17 Jun 2013 16:32:15 GMT',
 'location': 'http://www.youtube.com/watch?v=xdeFB7I0YH4',
 'pragma': 'no-cache',
 'server': 'Microsoft-IIS/7.0',
 'vary': 'Accept-Encoding',
 'x-aspnet-version': '4.0.30319',
 'x-aspnetmvc-version': '3.0',
 'x-powered-by': 'ASP.NET'}
history:  []

使用的请求:0.13.2

对于请求 1.2.3，我得到了类似的结果。