webman服务间歇性卡顿

upstream test {
    server 127.0.0.1:8787;
    keepalive 10240;
}

location /api/test {
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header Host $host;
    proxy_http_version 1.1;
    proxy_set_header Connection "";
    if (!-f $request_filename){
        proxy_pass http://test;
    }
}