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I was able to get to a website by using both IE and 
FireFox but my Python code kept giving HTTP 400 Bad 
request error. To debug, I set set_http_debuglevel(1) as 
in the following code:
hh = urllib2.HTTPHandler() 
hh.set_http_debuglevel(1)
opener = urllib2.build_opener
(hh,urllib2.HTTPCookieProcessor(self.cj))
The printed debug messages show that this crash 
happens when there is a space in the redirected 
location. Here's a cut-and-paste of the relevant debug 
messages (note the line starting with send that 
http_error_302 is sending):
reply: 'HTTP/1.1 302 Moved Temporarily\r\n'
header: Connection: close
header: Date: 2005年2月27日 19:52:51 GMT
header: Server: Microsoft-IIS/6.0
<---other header data-->
send: 'GET /myEmail/User?asOf=02/26/2005 11:38:12 
PM&
ddn=87cb51501730
<---remaining header data-->
reply: 'HTTP/1.1 400 Bad Request\r\n'
header: Content-Type: text/html
header: Date: 2005年2月27日 19:56:45 GMT
header: Connection: close
header: Content-Length: 20
To fix this, I first tried to encode the redirected location 
in the function http_error_302() in urllib2 using the 
methods urllib.quote and urllib.urlencode but to no avail 
(they encode other data as well). 
A temporary solution that works is to replace any space 
in the redirected URL by'%20'. Below is a snippet of the 
function http_error_302 in urllib2 with this suggested fix:
def http_error_302(self, req, fp, code, msg, headers):
 # Some servers (incorrectly) return multiple 
Location headers
 # (so probably same goes for URI). Use first 
header.
 if 'location' in headers:
 newurl = headers.getheaders('location')[0]
 elif 'uri' in headers:
 newurl = headers.getheaders('uri')[0]
 else:
 return
 newurl=newurl.replace(' ','%20') # <<< TEMP FIX - 
inserting this line temporarily fixes this problem
 newurl = urlparse.urljoin(req.get_full_url(), newurl)
 <--- remainder of this function -->
Thanks!