Python GAE的BlobStore中的Blobs

我在GAE BlobStore中创建了Blob，这些文件创建成功，问题是当我尝试使用BlobKey为这些文件提供服务时，我得到的内容长度为0，如下所示：

Status: 200 OK
Cache-Control: no-cache
X-AppEngine-BlobKey: crXwVb6vKoS8OykvgPmSew==
Content-Type: application/zip
Content-Disposition: attachment; filename="test.zip"
Expires: Fri, 01 Jan 1990 00:00:00 GMT
Content-Length: 0

为了使test.zipis成为在BlobStore中创建的文件，我在管理控制台中检查了BlobStore，并成功创建了该文件。 编辑： 下载.py代码：

def mime_type(filename):
    return guess_type(filename)[0]
class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler):
    def get(self):

        blob_key = self.request.get('key')
        blob_key = str(urllib.unquote(blob_key))
        blob_info = blobstore.BlobInfo.get(blob_key)
        content_type1 =mime_type(blob_info.filename)
        save_as1 =  blob_info.filename
        self.send_blob(blob_key,content_type=content_type1,save_as=save_as1)



def main():

    application = webapp.WSGIApplication([
            (r'/download.*', ServeHandler),
        ], debug=True)
    run_wsgi_app(application)



if __name__ == '__main__':
    main()

密钥在URL中的存在形式为：

http://localhost:8080/download.py?key=Es9f00P29wNTZoeL9ccS4g==

我得到它是为了从blobstore那里得到一个斑点

---

提前感谢。

根据文档字符串：

Args:
  blob_key_or_info: BlobKey or BlobInfo record to serve.
  content_type: Content-type to override when known.
  save_as: If True, and BlobInfo record is provided, use BlobInfos
    filename to save-as.  If string is provided, use string as filename.
    If None or False, do not send as attachment.
  start: Start index of content-range to send.
  end: End index of content-range to send.  End index is inclusive.
  use_range: Use provided content range from requests Range header.
    Mutually exclusive to start and end.

尝试将代码更改为

class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler):
  def get(self):
    blob_key = BlobKey(urllib.unquote(self.request.get('key')))
    self.send_blob(blob_key, save_as=True)

---

根据文档字符串：

Args:
  blob_key_or_info: BlobKey or BlobInfo record to serve.
  content_type: Content-type to override when known.
  save_as: If True, and BlobInfo record is provided, use BlobInfos
    filename to save-as.  If string is provided, use string as filename.
    If None or False, do not send as attachment.
  start: Start index of content-range to send.
  end: End index of content-range to send.  End index is inclusive.
  use_range: Use provided content range from requests Range header.
    Mutually exclusive to start and end.

尝试将代码更改为

class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler):
  def get(self):
    blob_key = BlobKey(urllib.unquote(self.request.get('key')))
    self.send_blob(blob_key, save_as=True)

---

@彼得·克内戈：好的，我会编辑这个问题。你从哪里弄来的布布基？看起来它是Base64编码的。@Peter Knego:首先我在BlobStore中创建了zip存档文件，然后获取该文件的密钥并通过URL将其传递到download.py，然后在此页面中获取密钥并尝试获取blob。尝试不使用content\u type参数，而使用save\u as=True@Peter克内戈：谢谢你的帮助，问题是我试图在处理程序中打印blob_键，我删除了这条语句，它成功了。//内容类型并按需要保存them@Peter克内戈：好的，我会编辑这个问题。你从哪里弄来的布卢基？看起来它是Base64编码的。@Peter Knego:首先我在BlobStore中创建了zip存档文件，然后获取该文件的密钥并通过URL将其传递到download.py，然后在此页面中获取密钥并尝试获取blob。尝试不使用content\u type参数，而使用save\u as=True@Peter克内戈：谢谢你的帮助，问题是我试图在处理程序中打印blob_键，我删除了这条语句，它成功了。//内容类型并按需要保存