Add /etc/hosts support to NGINX's own resolver

[Yichun Zhang (agentzh)]

Hi guys!

I wonder if you have any plans or interest in adding support for
system hosts configuration files (like /etc/hosts on Linux/*BSD/Mac OS
X) to NGINX's own nonblocking resolver implementation. This makes
debugging and other sysadmin work much easier otherwise we must set up
a local DNS server for special host names to work.

Thanks for your attention!

Best regards,
-agentzh