Setting a header inside an if block

[Ruslan Ermilov]

On Wed, Feb 05, 2014 at 05:12:55PM -0500, justink101 wrote:
> I don't have the auth_request module? All I need to do, is set the
> WWW-Authenticate header.

So you only want to ensure that the basic authentication
was attempted, but don't want to check the credentials on
the nginx side?  Here's how:

http {
    map $remote_user $realm {
	'' mydomainhere.com;
	default off;
    }

    server {
	auth_basic $realm;
	auth_basic_user_file /dev/null;
    }
}

It means that HTTTP basic authentication by nginx will be
disabled ("off") if $remote_user is not empty, and enabled
(and return 401 with an appropriate header) otherwise.