Interesting.  If you are an owner of the Cloud Platform project where this 
application is deployed, you should indeed be able to download the 
application code using *appcfg.py download_app* as documented in Downloading 
Your Source Code 
<https://cloud.google.com/appengine/docs/standard/python/tools/downloading-source-code>
.

   - Does the request complete successfully despite returning 0 files or 
   does is hang on *Fetching file list...*?
   - Has anyone working with the project ever permanently prohibited code 
   downloads as available in the App Engine Settings of the Cloud Console?  I 
   haven't tried this in some time but I believe you should get an error 
   message if this is the case and not a hang.
   - Can anyone else working with the project successfully download the 
   code using *appcfg.py download_app*?
   - If you have *App Engine Code Viewer* ACLs, you should be able to view 
   the code in the Stackdriver Debug page 
   <https://console.cloud.google.com/debug>.  Is there any code shown there?
   
If code download has not been disabled and you still cannot access the 
application code even with all the proper ACLs mentioned above, it's 
possible that your project is in a strange state.  In which case, I would 
recommend filing a public issue on our Issue Tracker 
<https://issuetracker.google.com/issues/new>.  If you do so, post a link to 
it here.  We can make the issue private so that you can disclose your 
project ID.

On Saturday, May 20, 2017 at 5:53:11 PM UTC-4, Lewis wrote:
>
>
> I'm trying to take a look at a Google App Engine project started by 
> another developer and deployed to the Google Cloud Platform. I have project 
> owner rights. When running appcfg.py -A [appID] -V  [version] download_app 
> [location] there are no errors, but no files come down. 
>
> 12:00 PM Host: appengine.google.com
> 12:00 PM Fetching file list...
> 12:00 PM Fetching files...
>
> If the appID is invalid, or the version is invalid appfcg.py displays an 
> error, 
>
> 12:00 PM Host: appengine.google.com
> 12:00 PM Fetching file list...
> Error 404: --- begin server output ---
> This application does not exist (project_id=u'invalid'). To create an App 
> Engine application in this project, run "gcloud app create" in your console.
>
> or
>
> 12:00 PM Host: appengine.google.com
> 12:00 PM Fetching file list...
> Error 400: --- begin server output ---
> Major version "123" does not exist.
>
> but when the appID and version are valid it simply downloads nothing. Any 
> suggestions?
>

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