nginx 下载APK 直接展示到网页还是乱码

Question

nginx mime 我配置了
application/vnd.android.package-archive apk;
application/iphone pxl ipa;

    nginx.config:

#user nobody;
worker_processes 8;

#error_log logs/error.log;
#error_log logs/error.log notice;
#error_log logs/error.log info;

#pid logs/nginx.pid;

events {
worker_connections 1024;
}

http {
include mime.types;
#default_type application/octet-stream;

#log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
#                  '$status $body_bytes_sent "$http_referer" '
#                  '"$http_user_agent" "$http_x_forwarded_for"';

#access_log  logs/access.log  main;

sendfile        on;
#tcp_nopush     on;

#keepalive_timeout  0;
keepalive_timeout  65;

#gzip  on;

server {
    listen       80;
    server_name  ip;

    location / {
          proxy_pass http://localhost:8081;
          proxy_set_header   Host    $host;
          proxy_set_header   X-Real-IP   $remote_addr;
          proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
    }


}
 server {
    listen       80;
    server_name  ip;


    location /  {
          proxy_pass http://localhost:9081;
          proxy_set_header   Host    $host;
          proxy_set_header   X-Real-IP   $remote_addr;
          proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
    }


}

}

求大神告诉怎么配置才能访问url 直接下载APK