Solve cross-domain problems through nginx location proxy_pass

In the development of calling api once, www.abc.com needs to call the api in api.www.abc.com to complete the file upload.
After the interface is written, there is a cross-domain problem, and the normal request cannot be completed.
The browser returns:

Request Method ：OPTIONS

Later, I thought that nginx has a location proxy_pass, which can handle my problem:

Modify the nginx configuration as follows:

server {
  listen 80;
      server_name www.abc.com;
  location / {
    proxy_pass http://192.168.1.1:8080;
  }
  location /upload_api/ {
    proxy_pass http://192.168.1.33:8080/;
  }
}

Configure a subdomain to point to the original api.www.abc.com address to handle cross-domain issues.

www.abc.com/upload_api/

Although the cross-domain problem is dealt with, the domain name url address is changed. This is not a surefire way.