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Old 09-15-2012, 04:44 AM   #1
sabarishsubramanian
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Functioning of Download Manager


How does a download manager resumes its download when its paused??What is the mechanism behind it??Can anybody explain it clearly??
 
Old 09-15-2012, 08:14 AM   #2
SecretCode
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As I understand it:

The download manager records how much it's retrieved, and save this every few seconds / few minutes / when paused.
When resumed, it uses the Range headers for partial GET requests (for http - or equivalents for ftp/sftp) and appends what it receives to the file saved so far.

Not all web servers support partial gets, but the majority do.

See e.g. HTTP/1.1: Method Definitions
 
Old 09-19-2012, 04:18 AM   #3
sabarishsubramanian
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Thank you sir.you cleared my doubt
 
  


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