代码如下：funccheck_url(urlstring){client:=&http.Client{Timeout:time.Second*5,}req,_:=http.NewRequest("GET",url,nil)req.Header.Set("User-Agent","Mozilla/5.0(WindowsNT6.3;Win64;x64)AppleWebKit/537.36(KHTML,likeGecko)Chrome/99.0.4844.82Safari/537