[Mongrel] x_send_file sends a 1 byte file

Matte Edens matte at ruckuswireless.com
Tue Jun 17 13:37:01 EDT 2008

If you do have X-SendFile installed make sure your settings for it are 
correct as well.  I got caught by this the other day too.  I had 
forgotten to add...

|XSendFile on
XSendFileAllowAbove on

|||to my VirtualHost config.


matte - webmaster
webmaster at ruckuswireless.com
Kirk Haines wrote:
> On Tue, Jun 17, 2008 at 1:23 AM, Jeremy Kemper <jeremy at bitsweat.net> wrote:
>> On Mon, Jun 16, 2008 at 11:35 PM, George Schreiber <lists at ruby-forum.com> wrote:
>>> Hello,
>>> sorry if creating a dupe...
>>> I'm trying to download files to authenticated users in my app. I've set
>>> up x_send_file. All seems to be correct to me, however when I try to
>>> download any file, I get a 1-byte long file downloaded.
>> This only works with a frontend httpd to intercept the X-Sendfile
>> response header and send the actual file.
>> Without a frontend httpd, you're seeing the expected result. Use
>> firebug to verify.
> To expand on what Jeremy said, x_send_file just sets an HTTP header,
> X-Sendfile, in the response.
> It's up to whatever is running in front of your processes to see that
> header and then to do something with it.
> So, in order to adequately test it, you will have to have _something_
> in front of your processes which handle it.  Also be aware that only
> some web servers implement X-Sendfile (Apache, via mod_xsendfile,
> lighttpd natively [it originated with them], and Swiftiply are the
> three that come to mind).  Litespeed has their own redirect syntax
> (which they spin to make it sound better than the others).  Nginx also
> has it's own approach with x-accel-redirect (which Swiftiply may
> support in the future, as well).
> So if you are using any one of those mechanisms for delivering static
> file downloads, to test it you will have to have a compatible front
> end running, and without some (fairly minor) code changes, you are
> locked into whatever one you choose to use.
> Hope this helps.
> Kirk Haines
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> Mongrel-users at rubyforge.org
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