location /photo/ {
               gridfs emew
               root_collection=fs
               field=filename
               user=super
               pass=super
               type=string;
               mongo 
                10.246.xx.xx:27017;
        }

2018/10/12 13:47:52 [notice] 28714#0: signal process started
2018/10/12 13:47:52 [error] 28715#0: Invalid mongo user/pass: super/super