server {

    ...

    proxy_buffers  1024k;

    proxy_buffer_size 1024k;

    ...

}

或是

server {

        listen       **;

        server_name  *********.com;

        #charset koi8-r;

        access_log  logs/***.access.log;

        error_log   logs/****.error.log;

        location / {

            root   /server/***/**;

            index  **.html ;

        }

        location ^~ /**/ {

           proxy_pass http://*****。****;

           proxy_connect_timeout 60s;

           proxy_read_timeout 5400s;

           proxy_send_timeout 5400s;

           proxy_redirect off;

　　　　　　 proxy_buffers 16 1024k;

    　　　　proxy_buffer_size 1024k;

}