how can I use external URI with the auth_request module

[Litichevskij Vova]

Hello!

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 <http://stackoverflow.com/questions/42380402/how-can-i-use-external-uri-with-the-nginxs-auth-request-module#>	
I'm trying to use nginx's ngx_http_auth_request_module in such way:

server {

    location / {
        auth_request http://external.url;
        proxy_pass http://protected.resource;
    }
}
It doesn't work, the error is:

2017/02/21 02:45:36 [error] 17917#0: *17 open() "/usr/local/htmlhttp://external.url" failed (2: No such file or directory), ...
Or in this way with named location:

server {

    location / {
        auth_request @auth;
        proxy_pass http://protected.resource;
    }

    location @auth {
        proxy_pass http://external.url;
    }
}
In this case the error is almost the same:

2017/02/22 03:13:25 [error] 25476#0: *34 open() "/usr/local/html at auth" failed (2: No such file or directory), client: 127.0.0.1, server: , request: "GET / HTTP/1.1", subrequest: "@auth", host: "127.0.0.1"
I know there is a way like this:

server {

    location / {
        auth_request /_auth_check;
        proxy_pass http://protected.resource;
    }

    location /_auth_check {
        internal;
        proxy_pass http://external.url;
    }
}
But in this case the http://protected.resource can not use the /_auth_check path.

Is there a way to use an external URI as a parameter for the auth_request directive without overlapping the http://protected.resource routing?

If not, why?
It looks a little bit strange to look for the auth_request's URI through static files (/usr/local/html).


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