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How JFileUpload could resume broken uploads ?

April 26, 2017Broken jfileupload resume uploads

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How JFileUpload could resume broken uploads ?

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Uncomplete upload could occur on system/network failure or simply because you’ve cancelled upload. JFileUpload can resume uncomplete uploads. Use “resume” parameter to enable this feature. JFileUpload sends an additional request to server to know if current upload should be resumed. If you’re interested in knowing how it works then see details below: For FTP: 1 – Applet sends LIST command with current filename to upload. 2 – FTP server returns remote file info (size, date) if available. 3 – If remote file size < local file size then Applet sends REST resumeindex command. 4 - Applet sends STOR command to upload file (starting at resumeindex). For HTTP: Resuming is more complex and requires a server-side script that supports "Content-Range" header : 1 - Applet sends HEAD request with "filename" header for current upload. 2 - Server script must return "HTTP 404 not found" response if file does not exist or "HTTP 200 OK" response with file size in a "size" header if file exists. 3 - If rem