fix linting issues

Signed-off-by: sadmansakib <ssadman8@gmail.com>

http_example_test.go

@@ -7,8 +7,6 @@ import (
 	"bytes"
 	"crypto/rsa"
 	"fmt"
-	"github.com/dgrijalva/jwt-go"
-	"github.com/dgrijalva/jwt-go/request"
 	"io"
 	"io/ioutil"
 	"log"
@@ -17,6 +15,9 @@ import (
 	"net/url"
 	"strings"
 	"time"
+
+	"github.com/dgrijalva/jwt-go"
+	"github.com/dgrijalva/jwt-go/request"
 )
 
 // location of the files used for signing and verification
@@ -55,6 +56,7 @@ func init() {
 
 	// Setup listener
 	listener, err := net.ListenTCP("tcp", &net.TCPAddr{})
+	fatal(err)
 	serverPort = listener.Addr().(*net.TCPAddr).Port
 
 	log.Println("Listening...")

token.go

@@ -65,7 +65,7 @@ func (t *Token) SignedString(key interface{}) (string, error) {
 func (t *Token) SigningString() (string, error) {
 	var err error
 	parts := make([]string, 2)
-	for i, _ := range parts {
+	for i := range parts {
 		var jsonValue []byte
 		if i == 0 {
 			if jsonValue, err = json.Marshal(t.Header); err != nil {