[Rails] send_file problem with IE7. Save Image as untitled.bmp

[Noel Walters]

Platform = Linux and Mongrel

I'm using send_file to send images from a controller. like this:

send_file( @content.location, :disposition => 'inline', :type =>
File.mime_type?(@content.location)) # mime_type? courtesy of mimetype_fu

This is called for in an ordinary <img> tag.

It all works perfectly except for one minor hitch which is driving me
mad.

If you right click on the image in IE7 and choose "Save Image As..." the
file save dialog always defaults the filename to "untitled.bmp".

Other browsers always get the correct file name (usually something like
"61.png" or "18.jpg")

If I copy the file into the corresponding path under RAILS_ROOT/public
then IE7 will get the filename correct - as will all browsers.

Interestingly if you do save the file as untitled.bmp it's a perfectly
good bmp file.

The HTTP headers set by mongrel differ substantially from the ones set
by send_file.

Using send_file gives:

Status=OK - 200
Date=Tue, 16 Sep 2008 18:16:59 GMT
Server=Mongrel 1.1.4
Vary=Host
Status=200 OK
X-Runtime=0.01416
Content-Transfer-Encoding=binary
Cache-Control=private
Content-Disposition=inline; filename="16.jpg"
Content-Type=image/jpeg
Content-Length=164553
X-Cache=MISS from www.sharehost.co.uk
Keep-Alive=timeout=15, max=100
Connection=Keep-Alive

Serving the file from the public area gives:

Status=OK - 200
Date=Tue, 16 Sep 2008 18:17:09 GMT
Vary=Host
Etag="48cfb25c-65c2f-918190"
Last-Modified=Tue, 16 Sep 2008 13:19:24 GMT
Content-Type=image/jpeg
Content-Length=416815
X-Cache=MISS from www.sharehost.co.uk
Keep-Alive=timeout=15, max=99
Connection=Keep-Alive

Anybody know what I can do about this?
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