What happens when upload is slower than download when "allowReadUploadsInProgress" is enabled?

Date Published: 01/14/2014 8:42 PM
Author: Josh M.

Setting the configuration option fileHandling/allowReadUploadsInProgress in IIS (FTP) allows a file to be downloaded (or opened) while it is being uploaded. This could be handy for large files where the FTP server is an intermediary.

However, what happens when the download is faster than the upload and it runs out of data (while the upload is still chugging along)? Supposed you start the upload of a 10GB file and then start the download of that same file shortly after. They'd be racing each other. Will IIS wait and feed more data as it becomes available in the file or will the download stop/fail when the file is completely transferred, regardless of whether the entire file has been uploaded?

See here: http://www.iis.net/configreference/system.applicationhost/sites/site/ftpserver/filehandling#005

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