Resume the download from the last stopped stage by How?

If a client send a request to the server using RTSP to download a photo,doc,audio file. it locates the file by using path which is stored in database.the source file want to store in a cache,because it will send back to client,at that time whether connection problem may occur due to network problem between server and client,when i get re-connection i need to resume the remaining part of files to download,i don't need to download from starting stage,wht is coding for that?
Thank You.

See [/questions/761494]
* Move the old .part partial download and the final file without the .part that has size 0 to another location.
* Start a new download and pause it, don't close Firefox.
* Copy the two files (.part and 0 byte final) that you moved above back to the download location to replace the new files that were created.
* Resume the download in Firefox.

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