urllib2.urlopen传入一个Request为何会返回URLError？而传入固定url时可以返回HTTPError？

Question

1.用URLlib2的urlopen向django发送了一个request：
传入一个固定的URL时：

try:
    response = urllib2.urlopen("http://cloud-server:8005/cloud_slice/handlefiles")
except urllib2.HTTPError, e:
    print "HTTPError:"
    if hasattr(e,"code"):
        print e.code
    if hasattr(e,"reason"):
        print e.reason
except urllib2.URLError, e:
    if hasattr(e,"code"):
        print e.code
    if hasattr(e,"reason"):
        print e.reason

在django端的进行了用户权限判断：

if not request.user.is_authenticated():
    logging.warning("handleFiles:User is not authenticated!")
    return HttpResponseForbidden()

然后我得到了一个HTTPError的返回：

HTTPError:
403
FORBIDDEN

2.但如果传入的参数是一个包含data和headers的urllib2.Request，如下：
cloud_slice_url="http://cloud-server:8005/cloud_slice/handlefiles"
datagen, headers = multipart_encode({"file": open(stlPath,"rb"), "id": self._profile_id})
request = urllib2.Request(cloud_slice_url, datagen, headers)
try:
    response = urllib2.urlopen(request, timeout=1000)
except urllib2.HTTPError, e:
    print "HTTPError:"
    if hasattr(e,"code"):
        print e.code
    if hasattr(e,"reason"):
        print e.reason
except urllib2.URLError, e:
    if hasattr(e,"code"):
        print e.code
    if hasattr(e,"reason"):
        print e.reason

就会得到一个URLError:

URLError:
[Errno 32] Broken pipe

3.请问如何在传入request对象时同样得到一个403 HTTRError的返回？
https://docs.python.org/2/lib...中提到了HTTPError是“This is useful when handling exotic HTTP errors, such as requests for authentication.”

Answer 1

如果上传文件，需要用MultipartParam包一下：

datagen, headers = multipart_encode([MultipartParam("file",open(stlPath,"rb")), MultipartParam("id", self._profile_id)])

关于MultipartParam:

Represents a single parameter in a multipart/form-data request