FastCGI - X-Sendfile and X-Sendfile2

I am trying to change the web server I use to OLS.

My FastCGI app uses X-Sendfile and X-Sendfile2 headers to respond to a request with local file or part of local file on the OLS host. My web server host is on a DMZ network, while my FastCGI app is on the internal network. The files are not available on the internal network, only on the DMZ in my current setup.

I have tried to find support for X-Sendfile and X-Sendfile2 in OLS, but I have not found anything.

Is this not supported in OLS?

Is it supported in LSWS?