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res.attachment()
Sets the "Content-Disposition" header of the current response to "attachment". If a filename is given, then the "Content-Type" will be automatically set based on the extension of the file (e.g. .jpg or .html), and the "Content-Disposition" header will be set to "filename=filename".
Usage
res.attachment([filename]);
Example
res.attachment();
// -> response header will contain:
// Content-Disposition: attachment
res.attachment('path/to/logo.png');
// -> response header will contain:
// Content-Disposition: attachment; filename="logo.png"
// Content-Type: image/png
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