Revert "HEAD operation changes to fasthttp"

This reverts commit 58f126fd27.

weed/util/http_util.go

@@ -12,8 +12,6 @@ import (
 	"net/url"
 	"strings"
 
-	"github.com/valyala/fasthttp"
-
 	"github.com/chrislusf/seaweedfs/weed/glog"
 )
 
@@ -85,23 +83,16 @@ func Get(url string) ([]byte, error) {
 	return b, nil
 }
 
-func Head(url string, fn func(header fasthttp.ResponseHeader)) error {
-	req := fasthttp.AcquireRequest()
-	resp := fasthttp.AcquireResponse()
-	defer fasthttp.ReleaseRequest(req)   // <- do not forget to release
-	defer fasthttp.ReleaseResponse(resp) // <- do not forget to release
-
-	c := fasthttp.Client{}
-	req.SetRequestURI(url)
-	req.Header.SetMethod(fasthttp.MethodHead)
-	if err := c.Do(req, resp); err != nil {
-		return err
+func Head(url string) (http.Header, error) {
+	r, err := client.Head(url)
+	if err != nil {
+		return nil, err
 	}
-	if resp.StatusCode() >= 400 {
-		return fmt.Errorf("%s: %d", url, resp.StatusCode())
+	defer r.Body.Close()
+	if r.StatusCode >= 400 {
+		return nil, fmt.Errorf("%s: %s", url, r.Status)
 	}
-	fn(resp.Header)
-	return nil
+	return r.Header, nil
 }
 
 func Delete(url string, jwt string) error {