Tanyaofeng wrote:

> 4.We found an issue:
>
> The file server was shut down during sending file data, the curl can’t stop sending data after it received FIN from
> Http Proxy Server until file data was sent finished.

If this was a serious issue, it would have been fixed
years ago. Use netstat (or Process Explorer etc.) and you probably see
curl's socket is in CLOSE_WAIT state.

Read here on the subject of a "half-open TCP connection":
   https://superuser.com/questions/298919/what-is-tcp-half-open-connection-and-tcp-half-closed-connection

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