解决跨域（nginx版）

location / { 
    proxy_set_header Host $host; 
    proxy_set_header X-Real-IP $remote_addr; 
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; 
    proxy_set_header X-Forwarded-Proto $scheme; 
    proxy_pass http://127.0.0.1:9501; 
    
    add_header 'Access-Control-Allow-Origin' '*'; 
    add_header 'Access-Control-Allow-Headers' '*'; 
    add_header 'Access-Control-Allow-Methods' '*'; 
    if ($request_method = 'OPTIONS') { 
        add_header 'Access-Control-Allow-Origin' '*'; 
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS'; 
        add_header 'Access-Control-Allow-Headers' '*'; 
        add_header 'Access-Control-Allow-Credentials' 'true'; 
        return 204; 
    } 
}