我为什么会收到错误：在ajax请求期间从上游读取响应头时，recv（）失败（104：由对等方重置连接）

I had problem with ajax. It always stopped working 5 min after request. I did't know what was causing it. I looked on many pages to find a sollution but nor provide good one. What I can do ?I had problem with ajax. It always stopped work