如何从Google App Engine上的URL将文件存储在Google存储上?

boto 或 gsutil HTTP requests ( PUT ) 我得到了错误签名的错误响应。显然我做错了什么,但不幸的是我不知道在哪里。

所以我的问题是:如何从URL中检索文件,并使用Python for Google App Angine将其存储在Google存储中?

以下是我所做的(使用另一个 answer

class ImportPhoto(webapp.RequestHandler):
    def get(self):
        self.response.headers['Content-Type'] = 'text/plain'
        srow = self.response.out.write
        url = self.request.get('url')
        srow('URL: %s\n' % (url))
        image_response = urlfetch.fetch(url)
        m = md5.md5()
        m.update(image_response.content)
        hash = m.hexdigest()
        time = "%s" % datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S GMT")
        str_to_sig = "PUT\n" + hash + "\n\n" + 
                      time + "\nx-goog-acl:public-read\n/lipis/8418.png"
        sig = base64.b64encode(hmac.new(
                                  config_credentials.GS_SECRET_ACCESS_KEY,
                                  str_to_sig, hashlib.sha1).digest())
        total = len(image_response.content) 
        srow('Size: %d bytes\n' % (total))

        header = {"Date": time,
                  "x-goog-acl": "public-read",
                  "Content-MD5": hash,
                  'Content-Length': total,
                  'Authorization': "GOOG1 %s:%s" % 
                                    (config_credentials.GS_ACCESS_KEY_ID, sig)}

        conn = httplib.HTTPConnection("lipis.commondatastorage.googleapis.com")
        conn.set_debuglevel(2)

        conn.putrequest('PUT', "/8418.png")
        for h in header:
            conn.putheader(h, header[h])
        conn.endheaders()
        conn.send(image_response.content + '\r\n')
        res = conn.getresponse()

        srow('\n\n%d: %s\n' % (res.status, res.reason))
        data = res.read()
        srow(data)
        conn.close()

我得到的回应是:

URL: https://stackoverflow.com/users/flair/8418.png
Size: 9605 bytes

400: Bad Request
<?xml version='1.0' encoding='UTF-8'?><Error><Code>BadDigest</Code><Message>The Content-MD5 you specified did not match what we received.</Message><Details>lipis/hello.jpg</Details></Error>