Nginx配置：
    http {
        include       mime.types;
        default_type  application/octet-stream;
        #最后发现是NGINX对header有所限制，下划线（_）不支持,通过以下配置解除限制。
        underscores_in_headers on;
        sendfile        on;
        keepalive_timeout  90s;
        keepalive_requests 2000;
        tcp_nodelay     on;
        tcp_nopush   on;
        gzip  on;
        server {
            listen 8999;
            server_name 127.0.0.1;
            root 路径;
            location / {
                try_files $uri $uri /index.html;
            }
            location ~^/api {
                proxy_pass http://127.0.0.1:7776;
                proxy_set_header X-Real-IP $remote_addr;
                proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            }
            location @router {
                rewrite ^.*$ /index.html last;
            }
            proxy_set_header X-Forwarded-Host $host;
            proxy_set_header X-Forwarded-Server $host;
        }
    }