Hi,

I'm using Rack::Sendfile (via Rails) and was wondering if someone could 
explain if what I'm experiencing is deliberate, or could be changed.

I've noticed when nginx adds the header "X-Sendfile-Type: 
X-Accel-Redirect", then Rack::Sendfile will jump into action. If the header 
"X-Accel-Mapping" is missing then it will not interfere. However, if both 
of the headers are present it will take over - even if the mapping cannot 
be resolved.

This doesn't make sense to me, as if the X-Accel-Mapping does not match the 
path of the file that is being attempted to send, then surely Rack:Sendfile 
should not interfere so that the file can be sent successfully albeit 
less efficiently?

Cheers

Theo