Pierre-Yves David <pierre-yves.david@logilab.fr> [Tue, 11 Dec 2012 17:17:40 +0100] rev 8610
[downloadable] fix filename HTTP header for simple name with space (closes #2535715)
Since d74addac92bb, we export simple ascii filename without any encoding in the
`filename` parameter of the `Content-Disposition` header. If this name contains
space this will fails, the parameter value will be truncated at the space
position. (eg. `filename=jungle babar.txt` read as `jungle`)
We need to quote the filename to prevent this (eg. `filename="jungle babar.txt"`).
Then literal quote and backslash needs to be escaped too.
The new escaping is correct according this extensive test case data base:
http://greenbytes.de/tech/tc2231/