nginx return 301 for dolphin possible ?

i was thinking if it is possible to use nginx return 301 for dolphin instead of rewrite? I ready in many places this way its more fast.

Answer is no, because the rewrites are used for a difference purpose.  Read up on 301 as well as Dolphin rewrites.

I have a feeling you still have not been able to add the rewrites to the server block.  PM me if you want me to do this for you.