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take a look at following code:
<code>
import urllib2
headers = [("Content-Type","application/oct-stream"),]
opener = urllib2.build_opener()
opener.addheaders = headers
urllib2.install_opener(opener)
print "after install_opener"
ret = opener.open('http://www.google.com',data="word=ss")
print ret.read()
</code>
I got real send data by wireshark:
POST / HTTP/1.1
Accept-Encoding: identity
Content-Length: 7
Host: www.dict.cn
Content-Type: application/x-www-form-urlencoded
Connection: close
word=ss
I had already set HTTP header of Content-Type, but actally urllib2
change this header.
I got this piece of code from urllib2.py:
 if request.has_data(): # POST
 data = request.get_data()
 if not request.has_header('Content-type'):
 request.add_unredirected_header(
 'Content-type',
 'application/x-www-form-urlencoded')
 if not request.has_header('Content-length'):
 request.add_unredirected_header(
 'Content-length', '%d' % len(data))
 scheme, sel = splittype(request.get_selector())
 sel_host, sel_path = splithost(sel)
 if not request.has_header('Host'):
 request.add_unredirected_header('Host', sel_host or host)
 for name, value in self.parent.addheaders:
 name = name.capitalize()
 if not request.has_header(name):
 request.add_unredirected_header(name, value)
first,urllib2 will add Content-Type if it's POST method, then it try to
add headers which holded by opener, but there's already 'Content-Type',
so the attribute->addheaders of opener will not append.
I can use Request to add 'Content-Type' header:
 request = urllib2.Request(url,headers=headers,data=body)
The example code that I wrote doesn't correct? or it's a problem of urllib2?