ngx_http_file_md5_module
===========================================

1. OVERVIEW

set md5 of a static file to variable 'file_md5'

2. USAGE

server {
    listen 3111;
    add_header Content-MD5 $file_md5;
}

the example shows how you set HTTP header 'Content-MD5' with file md5

3. LIMITATION

support only static files, proxy is beyond his ability