How to encode the filename parameter of Content-Disposition header in HTTP?

Question

Web applications that want to force a resource to be downloaded rather than directly rendered in a Web browser issue a Content-Disposition hea

Answer 1

I use the following code snippets for encoding (assuming fileName contains the filename and extension of the file, i.e.: test.txt):

---

PHP:

if ( strpos ( $_SERVER [ 'HTTP_USER_AGENT' ], "MSIE" ) > 0 )
{
     header ( 'Content-Disposition: attachment; filename="' . rawurlencode ( $fileName ) . '"' );
}
else
{
     header( 'Content-Disposition: attachment; filename*=UTF-8\'\'' . rawurlencode ( $fileName ) );
}

Java:

fileName = request.getHeader ( "user-agent" ).contains ( "MSIE" ) ? URLEncoder.encode ( fileName, "utf-8") : MimeUtility.encodeWord ( fileName );
response.setHeader ( "Content-disposition", "attachment; filename=\"" + fileName + "\"");