POST抓取页面的问题

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某同学反映，spider通过post方式抓取某站点有问题，老是302到自己，具体如下：

url ：http://www.meituan.com/multiact/default/deal/25814805.html

通过python可以正常抓取，抓取代码如下：

import urllib
import urllib2

values = {
        'yui_3_16_0_1_1423700000_000':'{"act":"deal/dynamiccomponent","args":25814805,"__referer":""}',
}
header={
        "X-Requested-With":"XMLHttpRequest",
}

url="http://www.meituan.com/multiact/default/deal/25814805.html"
data = urllib.urlencode(values)
print data
req = urllib2.Request(url, data,header)
response = urllib2.urlopen(req)
the_page = response.read()
print the_page

但是自己构造http请求包无法抓取，请求包如下：
POST /multiact/default/deal/25814805.html HTTP/1.1^M
Host: www.meituan.com^M
Content-Length: 126^M
Connection: close^M
Content-Type: application/x-www-form-urlencoded^M
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20100101 Firefox/6.0.2^M
Accept-Encoding: gzip^M
Accept: */*^M
X-Requested-With:  XMLHttpRequest^M

抓取失败原因，缺少该参数：Content-Type: application/x-www-form-urlencoded^M

加上就可以了，具体如下：

POST /multiact/default/deal/25814805.html HTTP/1.1^M
Host: www.meituan.com^M
Content-Length: 126^M
Connection: close^M
Content-Type: application/x-www-form-urlencoded^M
User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:6.0.2) Gecko/20100101 Firefox/6.0.2^M
Accept-Encoding: gzip^M
Accept: */*^M
X-Requested-With:  XMLHttpRequest^M

Content-Type: application/x-www-form-urlencoded^M

POST抓取页面的问题

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原文地址：http://blog.csdn.net/lsjseu/article/details/43972253