我無法從GAE BlobStore下載blob

此代碼有什麼問題？作爲UploadHandler響應發送的下載url後，我無法下載blob。我得到了服務器的404響應。我懷疑如何發送一個URL安全版本的BLOB密鑰。我無法從GAE BlobStore下載blob

import urllib 
import webapp2 
from google.appengine.ext import blobstore 
from google.appengine.ext.webapp import blobstore_handlers 

MAIN = """<html> 
<body> 
    <form action="%s" method="POST" enctype="multipart/form-data"> 
     <p>Upload File:<input type="file" name="file"></p> 
     <p><input type="submit" name="submit" value="Submit"> 
    </form> 
</body> 
</html> 
""" 

DOWNLOAD = """<html><body><p><a href="%s">%s</a></p></body></html>""" 

class MainHandler(webapp2.RequestHandler): 
    def get(self): 
     upload_url = blobstore.create_upload_url('/upload') 
     self.response.out.write(MAIN % upload_url) 

class UploadHandler(blobstore_handlers.BlobstoreUploadHandler): 
    def post(self): 
     upload_files = self.get_uploads('file') # 'file' is name field in the form 
     blob_info = upload_files[0] 
     _key = blob_info.key() 
     _url = '/download/%s' % str(_key) 
     _url_text = blob_info.filename 
     self.response.out.write(DOWNLOAD % (_url, _url_text)) 

class DownloadHandler(blobstore_handlers.BlobstoreDownloadHandler): 
    def get(self, resource): 
     blob_info = blobstore.Blob.get(resource) 
     self.sendblob(blob_info) 

app = webapp2.WSGIApplication([('/', MainHandler), 
           ('/upload', UploadHandler), 
           ('/download/<resource>', DownloadHandler)], 
           debug=True)

app.yaml文件是應用：GEOREF 版本：1 運行：python27 API_VERSION：1個線程：假

libraries: 
- name: webapp2 
    version: latest 

handlers: 
- url: /.* 
    script: georef.app

來源

2013-05-16 Daniel Walther Berns

它看起來像您複製並粘貼代碼從錯誤該文檔：

from google.appengine.ext import blobstore 
from google.appengine.ext.webapp import blobstore_handlers 
class ServeHandler(blobstore_handlers.BlobstoreDownloadHandler): 
    def get(self, resource): 
     resource = str(urllib.unquote(resource)) 
     blob_info = blobstore.BlobInfo.get(resource) 
     self.send_blob(blob_info)

你錯過了行的une如果資源字符串中有任何奇怪的字符，請對其進行編碼。

來源

2013-05-16 14:57:18 dragonx

確實，我編寫了閱讀文檔的代碼[https://developers.google.com/appengine/docs/python/tools/webapp/blobstorehandlers#BlobstoreUploadHandler]（docs），並且我忽略了行urllib調用。但是，我注意到在你的答案中，我拼錯send_blob（我在我的代碼中寫了sendblob）。所以，DownloadHandler不會被執行。除了urllib的引用和不引用的調用，還有另一個我不知道的麻煩。 –

你最好添加一些日誌語句來調試，並確保正確的值（如'resource'）被傳遞。您還想在管理員中使用blobstore查看器，以確保您的blob實際上傳。 – dragonx

我無法從GAE BlobStore下載blob

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