diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index f992dc0..03863ec 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ['1.12', '1.13', '1.14', '1.15', '1.16', '1.17', '1.18', '1.19', '1.20', '1.21', '1.22']
+        go: ['1.13', '1.14', '1.15', '1.16', '1.17', '1.18', '1.19', '1.20', '1.21', '1.22']
       fail-fast: false
 
     steps:
diff --git a/credentials/internal/http/http.go b/credentials/internal/http/http.go
index 03a77e3..6d18598 100644
--- a/credentials/internal/http/http.go
+++ b/credentials/internal/http/http.go
@@ -97,7 +97,7 @@ func Do(req *Request) (res *Response, err error) {
 		httpClient.Timeout = req.ReadTimeout + req.ConnectTimeout
 	}
 
-	transport := &http.Transport{}
+	transport := http.DefaultTransport.(*http.Transport).Clone()
 	if req.Proxy != "" {
 		var proxy *url.URL
 		proxy, err = url.Parse(req.Proxy)
diff --git a/credentials/providers/cli_profile_test.go b/credentials/providers/cli_profile_test.go
index 41bdf8f..9f14f84 100644
--- a/credentials/providers/cli_profile_test.go
+++ b/credentials/providers/cli_profile_test.go
@@ -249,4 +249,11 @@ func TestCLIProfileCredentialsProvider_GetCredentials(t *testing.T) {
 	assert.Equal(t, "aksecret", cc.AccessKeySecret)
 	assert.Equal(t, "ststoken", cc.SecurityToken)
 	assert.Equal(t, "cli_profile/ram_role_arn/ram_role_arn/static_ak", cc.ProviderName)
+
+	provider.innerProvider = new(testProvider)
+	cc, err = provider.GetCredentials()
+	assert.Nil(t, err)
+	assert.Equal(t, "test", cc.AccessKeyId)
+	assert.Equal(t, "test", cc.AccessKeySecret)
+	assert.Equal(t, "cli_profile/test", cc.ProviderName)
 }
diff --git a/credentials/providers/default.go b/credentials/providers/default.go
index d0a7cb3..4f130ff 100644
--- a/credentials/providers/default.go
+++ b/credentials/providers/default.go
@@ -61,6 +61,7 @@ func (provider *DefaultCredentialsProvider) GetCredentials() (cc *Credentials, e
 	if provider.lastUsedProvider != nil {
 		inner, err1 := provider.lastUsedProvider.GetCredentials()
 		if err1 != nil {
+			err = err1
 			return
 		}
 
diff --git a/credentials/providers/default_test.go b/credentials/providers/default_test.go
index ce651fd..0fe2102 100644
--- a/credentials/providers/default_test.go
+++ b/credentials/providers/default_test.go
@@ -1,6 +1,7 @@
 package providers
 
 import (
+	"errors"
 	"os"
 	"path"
 	"testing"
@@ -155,4 +156,43 @@ func TestDefaultCredentialsProvider_GetCredentials(t *testing.T) {
 	cc, err = provider.GetCredentials()
 	assert.Nil(t, err)
 	assert.Equal(t, &Credentials{AccessKeyId: "akid", AccessKeySecret: "aksecret", SecurityToken: "ststoken", ProviderName: "default/cli_profile/ram_role_arn/ram_role_arn/static_ak"}, cc)
+
+	provider.lastUsedProvider = new(testProvider)
+	cc, err = provider.GetCredentials()
+	assert.Nil(t, err)
+	assert.Equal(t, "test", cc.AccessKeyId)
+	assert.Equal(t, "test", cc.AccessKeySecret)
+	assert.Equal(t, "default/test", cc.ProviderName)
+
+	provider.lastUsedProvider = new(testErrorProvider)
+	_, err = provider.GetCredentials()
+	assert.Equal(t, "error", err.Error())
+}
+
+type testProvider struct {
+}
+
+func (provider *testProvider) GetCredentials() (cc *Credentials, err error) {
+	cc = &Credentials{
+		AccessKeyId:     "test",
+		AccessKeySecret: "test",
+		ProviderName:    "",
+	}
+	return
+}
+
+func (provider *testProvider) GetProviderName() string {
+	return "test"
+}
+
+type testErrorProvider struct {
+}
+
+func (provider *testErrorProvider) GetCredentials() (cc *Credentials, err error) {
+	err = errors.New("error")
+	return
+}
+
+func (provider *testErrorProvider) GetProviderName() string {
+	return "test"
 }
diff --git a/credentials/providers/profile_test.go b/credentials/providers/profile_test.go
index 535b288..77099c1 100644
--- a/credentials/providers/profile_test.go
+++ b/credentials/providers/profile_test.go
@@ -268,4 +268,15 @@ func TestProfileCredentialsProviderGetCredentials(t *testing.T) {
 	assert.Equal(t, "aksecret", cc.AccessKeySecret)
 	assert.Equal(t, "ststoken", cc.SecurityToken)
 	assert.Equal(t, "profile/ram_role_arn/static_ak", cc.ProviderName)
+
+	provider.innerProvider = new(testProvider)
+	cc, err = provider.GetCredentials()
+	assert.Nil(t, err)
+	assert.Equal(t, "test", cc.AccessKeyId)
+	assert.Equal(t, "test", cc.AccessKeySecret)
+	assert.Equal(t, "profile/test", cc.ProviderName)
+
+	provider.innerProvider = new(testErrorProvider)
+	_, err = provider.GetCredentials()
+	assert.Equal(t, "error", err.Error())
 }