diff --git a/io/socks/socks.go b/io/socks/socks.go
index 347b67ea9..bb84d73c9 100644
--- a/io/socks/socks.go
+++ b/io/socks/socks.go
@@ -2,65 +2,65 @@
 package socks
 
 import (
-  "fmt"
-  "io"
+	"fmt"
+	"io"
 )
 
 const (
-  socksVersion = uint8(5)
+	socksVersion = uint8(5)
 )
 
 // Authentication request header of Socks5 protocol
 type Socks5AuthenticationRequest struct {
-  version byte
-  authMethods [256]byte
+	version     byte
+	authMethods [256]byte
 }
 
 func ReadAuthentication(reader io.Reader) (auth Socks5AuthenticationRequest, err error) {
-  buffer := make([]byte, 2)
-  nBytes, err := reader.Read(buffer)
-  if err != nil {
-    return
-  }
-  if nBytes < 2 {
-    err = fmt.Errorf("Expected 2 bytes read, but actaully %d bytes read", nBytes)
-    return
-  }
-  
-  auth.version = buffer[0]
-  if auth.version != socksVersion {
-    err = fmt.Errorf("Unknown SOCKS version %d", auth.version)
-    return
-  }
-  
-  nMethods := buffer[1]
-  if nMethods <= 0 {
-    err = fmt.Errorf("Zero length of authentication methods")
-    return
-  }
-  
-  buffer = make([]byte, nMethods)
-  nBytes, err = reader.Read(buffer)
-  copy(auth.authMethods[:nBytes], buffer)
-  return
+	buffer := make([]byte, 2)
+	nBytes, err := reader.Read(buffer)
+	if err != nil {
+		return
+	}
+	if nBytes < 2 {
+		err = fmt.Errorf("Expected 2 bytes read, but actaully %d bytes read", nBytes)
+		return
+	}
+
+	auth.version = buffer[0]
+	if auth.version != socksVersion {
+		err = fmt.Errorf("Unknown SOCKS version %d", auth.version)
+		return
+	}
+
+	nMethods := buffer[1]
+	if nMethods <= 0 {
+		err = fmt.Errorf("Zero length of authentication methods")
+		return
+	}
+
+	buffer = make([]byte, nMethods)
+	nBytes, err = reader.Read(buffer)
+	copy(auth.authMethods[:nBytes], buffer)
+	return
 }
 
 type Socks5AuthenticationResponse struct {
-  version byte
-  authMethod byte
+	version    byte
+	authMethod byte
 }
 
 func (r *Socks5AuthenticationResponse) ToBytes() []byte {
-  buffer := make([]byte, 2 /* size of Socks5AuthenticationResponse */)
-  buffer[0] = r.version
-  buffer[1] = r.authMethod
-  return buffer
+	buffer := make([]byte, 2 /* size of Socks5AuthenticationResponse */)
+	buffer[0] = r.version
+	buffer[1] = r.authMethod
+	return buffer
 }
 
 func WriteAuthentication(writer io.Writer, response Socks5AuthenticationResponse) error {
-  _, err := writer.Write(response.ToBytes())
-  if err != nil {
-    return err
-  }
-  return nil
+	_, err := writer.Write(response.ToBytes())
+	if err != nil {
+		return err
+	}
+	return nil
 }