ngin conspires the 301 redirection setting method and the 301 redirection of the nginx subdirectory

The nginx version is 1.1.19.

If the domain name is transferred from a.com to b.com and you have ownership of both domains, you can:

server{
    server_name a.com;
    return 301 $scheme://b.com$request_uri;
}

Restart the server and see if it succeeds:

curl -I a.com

If I want to put www. b. com/bfiles/download/turn to dx1. b. com: 81 / bfiles/download, nginx conf file website under these writing:

location ~* ^/bfiles/download/ {  
rewrite ^/bfiles/download/(.*)$ http://dx1.b.com:81/bfiles/download/$1 permanent;  
}