diff --git a/weed/command/filer_export.go b/weed/command/filer_export.go
index 6ca360b44..d57acedc3 100644
--- a/weed/command/filer_export.go
+++ b/weed/command/filer_export.go
@@ -1,10 +1,10 @@
 package command
 
 import (
-	"github.com/chrislusf/seaweedfs/weed/server"
-	"github.com/spf13/viper"
 	"github.com/chrislusf/seaweedfs/weed/filer2"
 	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/server"
+	"github.com/spf13/viper"
 )
 
 func init() {
diff --git a/weed/s3api/chunked_reader_v4.go b/weed/s3api/chunked_reader_v4.go
index 35a97dffe..061fd4a92 100644
--- a/weed/s3api/chunked_reader_v4.go
+++ b/weed/s3api/chunked_reader_v4.go
@@ -22,9 +22,9 @@ import (
 	"bufio"
 	"bytes"
 	"errors"
+	"github.com/dustin/go-humanize"
 	"io"
 	"net/http"
-	"github.com/dustin/go-humanize"
 )
 
 // Streaming AWS Signature Version '4' constants.
@@ -43,7 +43,7 @@ var errMalformedEncoding = errors.New("malformed chunked encoding")
 // newSignV4ChunkedReader returns a new s3ChunkedReader that translates the data read from r
 // out of HTTP "chunked" format before returning it.
 // The s3ChunkedReader returns io.EOF when the final 0-length chunk is read.
-func newSignV4ChunkedReader(req *http.Request) (io.ReadCloser) {
+func newSignV4ChunkedReader(req *http.Request) io.ReadCloser {
 	return &s3ChunkedReader{
 		reader: bufio.NewReader(req.Body),
 		state:  readChunkHeader,
diff --git a/weed/s3api/filer_util.go b/weed/s3api/filer_util.go
index 67ce88a52..be807fb82 100644
--- a/weed/s3api/filer_util.go
+++ b/weed/s3api/filer_util.go
@@ -1,12 +1,13 @@
 package s3api
 
 import (
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
-	"time"
-	"os"
-	"fmt"
-	"github.com/chrislusf/glog"
 	"context"
+	"fmt"
+	"os"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 )
 
 func (s3a *S3ApiServer) mkdir(parentDirectoryPath string, dirName string) error {
diff --git a/weed/s3api/s3api_auth.go b/weed/s3api/s3api_auth.go
index f429ad28d..b680fe1e1 100644
--- a/weed/s3api/s3api_auth.go
+++ b/weed/s3api/s3api_auth.go
@@ -7,8 +7,8 @@ import (
 
 // AWS Signature Version '4' constants.
 const (
-	signV4Algorithm        = "AWS4-HMAC-SHA256"
-	signV2Algorithm        = "AWS"
+	signV4Algorithm = "AWS4-HMAC-SHA256"
+	signV2Algorithm = "AWS"
 )
 
 // Verify if request has JWT.
diff --git a/weed/s3api/s3api_object_handlers.go b/weed/s3api/s3api_object_handlers.go
index bd41a48fe..912b76230 100644
--- a/weed/s3api/s3api_object_handlers.go
+++ b/weed/s3api/s3api_object_handlers.go
@@ -43,7 +43,7 @@ func (s3a *S3ApiServer) PutObjectHandler(w http.ResponseWriter, r *http.Request)
 
 	rAuthType := getRequestAuthType(r)
 	dataReader := r.Body
-	if rAuthType == authTypeStreamingSigned{
+	if rAuthType == authTypeStreamingSigned {
 		dataReader = newSignV4ChunkedReader(r)
 	}