diff --git a/auth/jwt/jwt.go b/auth/jwt/jwt.go
index c1733da..a13032e 100644
--- a/auth/jwt/jwt.go
+++ b/auth/jwt/jwt.go
@@ -112,8 +112,7 @@ type auth struct {
 // Middleware returns jwt auth middleware
 func Middleware(key interface{}, alg jwa.SignatureAlgorithm, opts ...Option) func(next http.Handler) http.Handler {
 	a := &auth{}
-	opts = append(opts, SetKey(key))
-	opts = append(opts, SetAlgorithm(alg))
+	opts = append(opts, SetKey(key), SetAlgorithm(alg))
 	opts = append([]Option{DefaultOptions}, opts...)
 
 	for _, opt := range opts {
@@ -162,10 +161,10 @@ func Middleware(key interface{}, alg jwa.SignatureAlgorithm, opts ...Option) fun
 }
 
 // RespondWithUnauthorized is a default response handler
-func RespondWithUnauthorized(w http.ResponseWriter, r *http.Request, err error) {
+func RespondWithUnauthorized(w http.ResponseWriter, _ *http.Request, _ error) {
 	http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
 }
 
-func allowAll(token jwt.Token) (bool, interface{}) {
+func allowAll(_ jwt.Token) (bool, interface{}) {
 	return true, nil
 }
diff --git a/auth/jwt/jwt_test.go b/auth/jwt/jwt_test.go
index a6f7dcb..66af558 100644
--- a/auth/jwt/jwt_test.go
+++ b/auth/jwt/jwt_test.go
@@ -97,8 +97,8 @@ func TestJWTAuthParseVerify(t *testing.T) {
 	assert.Equal(t, http.StatusUnauthorized, res.StatusCode)
 
 	now := time.Now()
-	token.Set(jwt.IssuedAtKey, now.Add(-1*time.Hour))      // nolint:errcheck
-	token.Set(jwt.ExpirationKey, now.Add(-58*time.Minute)) // nolint:errcheck
+	token.Set(jwt.IssuedAtKey, now.Add(-1*time.Hour))      // nolint:errcheck // No need to check error here
+	token.Set(jwt.ExpirationKey, now.Add(-58*time.Minute)) // nolint:errcheck // No need to check error here
 	payload, err = jwt.Sign(token, jwa.HS512, []byte("tkey"))
 	assert.NoError(t, err)
 
@@ -120,7 +120,7 @@ func TestJWTAuthVerifyOptions(t *testing.T) {
 
 	token := jwt.New()
 
-	token.Set(jwt.IssuerKey, "wrongissuer") // nolint:errcheck
+	token.Set(jwt.IssuerKey, "wrongissuer") // nolint:errcheck // No need to check error here
 	payload, err := jwt.Sign(token, jwa.HS256, []byte("changethis"))
 	assert.NoError(t, err)
 
@@ -129,7 +129,7 @@ func TestJWTAuthVerifyOptions(t *testing.T) {
 	defer res.Body.Close()
 	assert.Equal(t, http.StatusUnauthorized, res.StatusCode)
 
-	token.Set(jwt.IssuerKey, "tissuer") // nolint:errcheck
+	token.Set(jwt.IssuerKey, "tissuer") // nolint:errcheck // No need to check error here
 	payload, err = jwt.Sign(token, jwa.HS256, []byte("changethis"))
 	assert.NoError(t, err)
 
@@ -155,16 +155,16 @@ func TestJWTAuthContext(t *testing.T) {
 	)
 
 	token := jwt.New()
-	token.Set(jwt.JwtIDKey, "tid") // nolint:errcheck
+	token.Set(jwt.JwtIDKey, "tid") // nolint:errcheck // No need to check error here
 
 	testCtxHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		data, ok := r.Context().Value(DataCtxKey).(*data)
 		require.True(t, ok)
 		assert.Equal(t, "test data", data.inner)
 
-		token, ok := r.Context().Value(JWTCtxKey).(jwt.Token)
+		ctxToken, ok := r.Context().Value(JWTCtxKey).(jwt.Token)
 		require.True(t, ok)
-		assert.Equal(t, "tid", token.JwtID())
+		assert.Equal(t, "tid", ctxToken.JwtID())
 
 		_, err := w.Write([]byte("resp"))
 		require.NoError(t, err)
@@ -181,7 +181,7 @@ func TestJWTAuthContext(t *testing.T) {
 	defer res.Body.Close()
 	assert.Equal(t, http.StatusOK, res.StatusCode)
 
-	token.Set(jwt.JwtIDKey, "invalid") // nolint:errcheck
+	token.Set(jwt.JwtIDKey, "invalid") // nolint:errcheck // No need to check error here
 	payload, err = jwt.Sign(token, jwa.HS256, []byte("changethis"))
 	assert.NoError(t, err)
 
diff --git a/auth/token/token.go b/auth/token/token.go
index 56c6fdb..bb8a5d8 100644
--- a/auth/token/token.go
+++ b/auth/token/token.go
@@ -114,10 +114,10 @@ func Middleware(opts ...Option) func(next http.Handler) http.Handler {
 }
 
 // RespondWithUnauthorized is a default response handler
-func RespondWithUnauthorized(w http.ResponseWriter, r *http.Request, err error) {
+func RespondWithUnauthorized(w http.ResponseWriter, _ *http.Request, _ error) {
 	http.Error(w, http.StatusText(http.StatusUnauthorized), http.StatusUnauthorized)
 }
 
-func rejectAll(token string) (bool, interface{}) {
+func rejectAll(_ string) (bool, interface{}) {
 	return false, nil
 }
diff --git a/find_token_test.go b/find_token_test.go
index 8c0f7f9..485ee43 100644
--- a/find_token_test.go
+++ b/find_token_test.go
@@ -9,42 +9,42 @@ import (
 )
 
 func TestTokenFromAuthorizationHeader(t *testing.T) {
-	req, err := http.NewRequest("GET", "/", nil)
+	req, err := http.NewRequest("GET", "/", http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("Authorization", "abc")
 	assert.Equal(t, "abc", TokenFromAuthorizationHeader(req))
 
-	req, err = http.NewRequest("GET", "/", nil)
+	req, err = http.NewRequest("GET", "/", http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("Authorization", "abcdefghe")
 	assert.Equal(t, "abcdefghe", TokenFromAuthorizationHeader(req))
 
-	req, err = http.NewRequest("GET", "/", nil)
+	req, err = http.NewRequest("GET", "/", http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("Authorization", "Bearer abc")
 	assert.Equal(t, "abc", TokenFromAuthorizationHeader(req))
 }
 
 func TestTokenFromHeader(t *testing.T) {
-	req, err := http.NewRequest("GET", "/", nil)
+	req, err := http.NewRequest("GET", "/", http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("X-Token", "abc")
 	assert.Equal(t, "abc", TokenFromHeader("X-Token")(req))
 }
 
 func TestTokenFromQuery(t *testing.T) {
-	req, err := http.NewRequest("GET", "/?token=abc", nil)
+	req, err := http.NewRequest("GET", "/?token=abc", http.NoBody)
 	require.Nil(t, err)
 	assert.Equal(t, "abc", TokenFromQuery("token")(req))
 }
 
 func TestTokenFromCookie(t *testing.T) {
-	req, err := http.NewRequest("GET", "/", nil)
+	req, err := http.NewRequest("GET", "/", http.NoBody)
 	require.Nil(t, err)
 	req.AddCookie(&http.Cookie{Name: "token", Value: "abc"})
 	assert.Equal(t, "abc", TokenFromCookie("token")(req))
 
-	req, err = http.NewRequest("GET", "/", nil)
+	req, err = http.NewRequest("GET", "/", http.NoBody)
 	require.Nil(t, err)
 	assert.Equal(t, "", TokenFromCookie("token")(req))
 }
diff --git a/logger/logger.go b/logger/logger.go
index cd6f9b1..64ee29d 100644
--- a/logger/logger.go
+++ b/logger/logger.go
@@ -113,7 +113,7 @@ func (s *logger) body(r *http.Request) string {
 	r.Body = ioutil.NopCloser(rdr)
 
 	if len(body) > 0 {
-		body = strings.Replace(body, "\n", " ", -1)
+		body = strings.ReplaceAll(body, "\n", " ")
 		body = regexpMultiWhitespace.ReplaceAllString(body, " ")
 	}
 
@@ -186,7 +186,7 @@ func Middleware(opts ...Option) func(http.Handler) http.Handler {
 }
 
 // DefaultLogHandler is a default log handler
-func DefaultLogHandler(entry LogEntry) {
+func DefaultLogHandler(entry LogEntry) { // nolint:gocritic // For backwards compatibility
 	log.Printf(
 		"%s - %s - %s - %d (%d) - %v",
 		entry.Method,
diff --git a/logger/tracking_response_writer.go b/logger/tracking_response_writer.go
index ae80f67..5854b37 100644
--- a/logger/tracking_response_writer.go
+++ b/logger/tracking_response_writer.go
@@ -8,7 +8,7 @@ import (
 )
 
 var (
-	errWriterNotImplentsHijacker = errors.New("ResponseWriter does not implement the Hijacker interface") // nolint:golint
+	errWriterNotImplentsHijacker = errors.New("ResponseWriter does not implement the Hijacker interface")
 )
 
 type trackingResponseWriter struct {
diff --git a/no_cache_test.go b/no_cache_test.go
index d848a35..59c1c0c 100644
--- a/no_cache_test.go
+++ b/no_cache_test.go
@@ -24,7 +24,7 @@ func TestNoCache(t *testing.T) {
 
 	client := http.Client{}
 
-	req, err := http.NewRequest("GET", server.URL, nil)
+	req, err := http.NewRequest("GET", server.URL, http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("ETag", "ETagValue")
 
diff --git a/ping.go b/ping.go
index ee2f092..80a1b88 100644
--- a/ping.go
+++ b/ping.go
@@ -11,7 +11,7 @@ func Ping(next http.Handler) http.Handler {
 		if r.Method == "GET" && strings.HasSuffix(strings.ToLower(r.URL.Path), "/ping") {
 			w.Header().Set("Content-Type", "text/plain")
 			w.WriteHeader(http.StatusOK)
-			w.Write([]byte("pong")) // nolint:errcheck
+			w.Write([]byte("pong")) // nolint:errcheck // No need to check error here
 
 			return
 		}
diff --git a/real_ip_test.go b/real_ip_test.go
index ffd31b1..673d1b9 100644
--- a/real_ip_test.go
+++ b/real_ip_test.go
@@ -26,7 +26,7 @@ func TestRealIPXRealIP(t *testing.T) {
 
 	client := http.Client{}
 
-	req, err := http.NewRequest("GET", server.URL, nil)
+	req, err := http.NewRequest("GET", server.URL, http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("X-Real-IP", "3.3.3.3")
 
@@ -46,7 +46,7 @@ func TestRealIPXForwardedFor(t *testing.T) {
 
 	client := http.Client{}
 
-	req, err := http.NewRequest("GET", server.URL, nil)
+	req, err := http.NewRequest("GET", server.URL, http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("X-Forwarded-For", "3.3.3.3")
 
@@ -55,7 +55,7 @@ func TestRealIPXForwardedFor(t *testing.T) {
 	defer res.Body.Close()
 	assert.Equal(t, http.StatusOK, res.StatusCode)
 
-	req, err = http.NewRequest("GET", server.URL, nil)
+	req, err = http.NewRequest("GET", server.URL, http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("X-Forwarded-For", "3.3.3.3, 4.4.4.4, 5.5.5.5")
 
@@ -71,7 +71,7 @@ func TestRealIPBothHeaders(t *testing.T) {
 
 	client := http.Client{}
 
-	req, err := http.NewRequest("GET", server.URL, nil)
+	req, err := http.NewRequest("GET", server.URL, http.NoBody)
 	require.Nil(t, err)
 	req.Header.Set("X-Real-IP", "3.3.3.3")
 	req.Header.Set("X-Forwarded-For", "4.4.4.4")
diff --git a/recoverer/recoverer.go b/recoverer/recoverer.go
index 24d35d4..d8ba1fe 100644
--- a/recoverer/recoverer.go
+++ b/recoverer/recoverer.go
@@ -79,7 +79,7 @@ func Middleware(opts ...Option) func(next http.Handler) http.Handler {
 }
 
 // RespondWithInternalServerError is a default response handler
-func RespondWithInternalServerError(w http.ResponseWriter, r *http.Request, err error) {
+func RespondWithInternalServerError(w http.ResponseWriter, _ *http.Request, _ error) {
 	http.Error(w, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
 }
 
diff --git a/throttle/throttle.go b/throttle/throttle.go
index 541f8bd..55b7db5 100644
--- a/throttle/throttle.go
+++ b/throttle/throttle.go
@@ -171,6 +171,6 @@ func Middleware(opts ...Option) func(http.Handler) http.Handler {
 }
 
 // RespondWithTooManyRequests is a default response handler
-func RespondWithTooManyRequests(w http.ResponseWriter, r *http.Request, err error) {
+func RespondWithTooManyRequests(w http.ResponseWriter, _ *http.Request, _ error) {
 	http.Error(w, http.StatusText(http.StatusTooManyRequests), http.StatusTooManyRequests)
 }
diff --git a/throttle/throttle_test.go b/throttle/throttle_test.go
index e931ff1..9d467c2 100644
--- a/throttle/throttle_test.go
+++ b/throttle/throttle_test.go
@@ -35,7 +35,7 @@ func TestThrottleBacklog(t *testing.T) {
 	var wg sync.WaitGroup
 	for i := 0; i < 1; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			res, err := client.Get(server.URL)
@@ -46,7 +46,7 @@ func TestThrottleBacklog(t *testing.T) {
 			b, err := ioutil.ReadAll(res.Body)
 			assert.NoError(t, err)
 			assert.Equal(t, "resp", string(b))
-		}(i)
+		}()
 	}
 
 	wg.Wait()
@@ -75,12 +75,12 @@ func TestThrottleClientTimeout(t *testing.T) {
 	var wg sync.WaitGroup
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			_, err := client.Get(server.URL)
 			assert.Error(t, err)
-		}(i)
+		}()
 	}
 
 	wg.Wait()
@@ -110,7 +110,7 @@ func TestThrottleTriggerGatewayTimeout(t *testing.T) {
 
 	for i := 0; i < 50; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			res, err := client.Get(server.URL)
@@ -118,21 +118,21 @@ func TestThrottleTriggerGatewayTimeout(t *testing.T) {
 			defer res.Body.Close()
 			assert.Equal(t, http.StatusOK, res.StatusCode)
 
-		}(i)
+		}()
 	}
 
 	time.Sleep(time.Second * 1)
 
 	for i := 0; i < 50; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			res, err := client.Get(server.URL)
 			assert.NoError(t, err)
 			defer res.Body.Close()
 			assert.Equal(t, http.StatusTooManyRequests, res.StatusCode)
-		}(i)
+		}()
 	}
 
 	wg.Wait()
@@ -162,7 +162,7 @@ func TestThrottleMaximum(t *testing.T) {
 
 	for i := 0; i < 20; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			res, err := client.Get(server.URL)
@@ -173,21 +173,21 @@ func TestThrottleMaximum(t *testing.T) {
 			b, err := ioutil.ReadAll(res.Body)
 			assert.NoError(t, err)
 			assert.Equal(t, "resp", string(b))
-		}(i)
+		}()
 	}
 
 	time.Sleep(time.Second * 1)
 
 	for i := 0; i < 20; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			res, err := client.Get(server.URL)
 			assert.NoError(t, err)
 			defer res.Body.Close()
 			assert.Equal(t, http.StatusTooManyRequests, res.StatusCode)
-		}(i)
+		}()
 	}
 
 	wg.Wait()
@@ -216,21 +216,21 @@ func TestThrottleRetryAfter(t *testing.T) {
 
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			res, err := client.Get(server.URL)
 			assert.NoError(t, err)
 			defer res.Body.Close()
 			assert.Equal(t, http.StatusOK, res.StatusCode)
-		}(i)
+		}()
 	}
 
 	time.Sleep(time.Second * 1)
 
 	for i := 0; i < 10; i++ {
 		wg.Add(1)
-		go func(i int) {
+		go func() {
 			defer wg.Done()
 
 			res, err := client.Get(server.URL)
@@ -238,7 +238,7 @@ func TestThrottleRetryAfter(t *testing.T) {
 			defer res.Body.Close()
 			assert.Equal(t, http.StatusTooManyRequests, res.StatusCode)
 			assert.Equal(t, res.Header.Get("Retry-After"), "3600")
-		}(i)
+		}()
 	}
 
 	wg.Wait()
diff --git a/timeout/timeout.go b/timeout/timeout.go
index da4da93..5f8f849 100644
--- a/timeout/timeout.go
+++ b/timeout/timeout.go
@@ -76,6 +76,6 @@ func Middleware(opts ...Option) func(next http.Handler) http.Handler {
 }
 
 // RespondWithTimeout is a default response handler
-func RespondWithTimeout(w http.ResponseWriter, r *http.Request, err error) {
+func RespondWithTimeout(w http.ResponseWriter, _ *http.Request, _ error) {
 	http.Error(w, http.StatusText(http.StatusGatewayTimeout), http.StatusGatewayTimeout)
 }
diff --git a/timeout/timeout_test.go b/timeout/timeout_test.go
index e67a1a7..a81dfa8 100644
--- a/timeout/timeout_test.go
+++ b/timeout/timeout_test.go
@@ -48,7 +48,8 @@ func TestTimeoutTimedOut(t *testing.T) {
 			return
 
 		case <-time.After(time.Second * 1):
-			w.Write([]byte("resp")) // nolint:errcheck
+			_, err := w.Write([]byte("resp"))
+			require.NoError(t, err)
 		}
 	})