auth_request /validate;

location = /validate {
    internal;

    if ($request_method = 'OPTIONS') {
        return 200;
    }

    proxy_pass http://172.17.0.1:9024/validate;
    proxy_set_header Host $http_host;
    proxy_pass_request_body off;
    proxy_set_header Content-Length "";

    # these return values are used by the @error401 call
    auth_request_set $auth_resp_jwt $upstream_http_x_vouch_jwt;
    auth_request_set $auth_resp_err $upstream_http_x_vouch_err;
    auth_request_set $auth_resp_failcount $upstream_http_x_vouch_failcount;
}

error_page 401 = @error401;

location @error401 {
    return 302 https://sso.faked.org/login?url=$scheme://$http_host$request_uri&vouch-failcount=$auth_resp_failcount&X-Vouch-Token=$auth_resp_jwt&error=$auth_resp_err;
}