In my Job List the target file can not be downloaded, the result column shows "download expired" 

Reasons:

If you are using the Web API Python client (Web API Downloads), the client will send a DELETE command to the server once the transfer of the target file has finished successfully. The file should be in your filesystem with the name specified on the 'target' keyword.

The files will stay in the system for ~3 days if:

1. The Python client connection has been interrupted/cancelled before the request was completed. See Using the Python client I have killed my request or the connection was interrupted - Web API FAQ
2. You are using the Web interface to download sample data

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