X-Sendfile <=> X-Accel-Redirect header

[Aleksandar Lazic]

Hi,

is behind yours X-Accel-Redirect the same idea as in X-Sendfile?!

http://celebnamer.celebworld.ws/stuff/mod_xsendfile/

---
.
.
If it encounters the presence of such header it will discard all output
and send the file specified by that header instead using Apache
internals including all optimizations like caching-headers and sendfile
or mmap if configured.
.
.
---

If so is it possible to add X-Sendfile to
'ngx_http_upstream_headers_in[]' in src/http/ngx_http_upstream.c ;-)

BTW: I haven't seen a doc for this, have I overseen it?!

Regards

Aleks