diff --git a/http.go b/http.go
index 7dd0401..a7acbec 100644
--- a/http.go
+++ b/http.go
@@ -93,7 +93,7 @@ func (d *Dialer) connect(c net.Conn, network, address string) error {
 		return errors.New("network not implemented")
 	}
 	req := &http.Request{
-		Method: "CONNECT",
+		Method: http.MethodConnect,
 		URL:    &url.URL{Opaque: address},
 		Host:   address,
 		Header: make(http.Header),
diff --git a/service/autoproxy.go b/service/autoproxy.go
index 08086de..57d494b 100644
--- a/service/autoproxy.go
+++ b/service/autoproxy.go
@@ -31,17 +31,30 @@ var errNoUpdateAvailable = errors.New("no update available")
 
 func parseAutoproxy(c *Client) (*proxy.PerHost, error) {
 	accessLogger.Print("check autoproxy")
-	resp, err := http.Get(autoproxyURL)
-	if err != nil {
+	ch := make(chan *http.Response, 1)
+	go func() {
+		if resp, err := http.Get(autoproxyURL); err == nil {
+			ch <- resp
+		} else {
+			errorLogger.Debug("failed to check autoproxy without using proxy", "error", err)
+		}
+	}()
+	go func() {
 		if t, ok := http.DefaultTransport.(*http.Transport); ok {
+			t = t.Clone()
 			t.Proxy = http.ProxyURL(c.u)
-			if resp, err = http.Get(autoproxyURL); err != nil {
-				errorLogger.Print(err)
-				return nil, err
+			if resp, err := (&http.Client{Transport: t}).Get(autoproxyURL); err == nil {
+				ch <- resp
+			} else {
+				errorLogger.Debug("failed to check autoproxy using proxy", "error", err)
 			}
-		} else {
-			return nil, err
 		}
+	}()
+	var resp *http.Response
+	select {
+	case <-time.After(time.Minute):
+		return nil, errors.New("failed to check autoproxy")
+	case resp = <-ch:
 	}
 	defer resp.Body.Close()
 	b, err := io.ReadAll(resp.Body)
@@ -68,6 +81,7 @@ func parseAutoproxy(c *Client) (*proxy.PerHost, error) {
 		}
 	}
 	last = string(b)
+	accessLogger.Print("autoproxy loaded")
 	return perHost, nil
 }
 
@@ -90,7 +104,6 @@ func initAutoproxy(c *Client) *proxy.PerHost {
 			}
 			return
 		}
-		accessLogger.Print("autoproxy updated")
 		c.autoproxy.PerHost = p
 	})
 	return p
diff --git a/service/httpproxy_test.go b/service/httpproxy_test.go
index 567e81a..937bf49 100644
--- a/service/httpproxy_test.go
+++ b/service/httpproxy_test.go
@@ -31,9 +31,11 @@ import (
 )
 
 var testHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	header := w.Header()
 	m := make(map[string]string)
-	for k := range r.Header {
+	for k, v := range r.Header {
 		m[k] = r.Header.Get(k)
+		header.Add(k, v[0])
 	}
 	b, _ := json.Marshal(m)
 	w.Write(b)
@@ -58,7 +60,7 @@ func newRequest(url string, m map[string]string) *http.Request {
 	return req
 }
 
-func do(proxy proxy.Dialer, url string, req *http.Request) (m map[string]string, err error) {
+func do(proxy proxy.Dialer, url string, req *http.Request) (resp *http.Response, m map[string]string, err error) {
 	c, err := proxy.Dial("tcp", strings.TrimPrefix(url, "http://"))
 	if err != nil {
 		return
@@ -66,7 +68,7 @@ func do(proxy proxy.Dialer, url string, req *http.Request) (m map[string]string,
 	if err = req.WriteProxy(c); err != nil {
 		return
 	}
-	resp, err := http.ReadResponse(bufio.NewReader(c), nil)
+	resp, err = http.ReadResponse(bufio.NewReader(c), nil)
 	if err != nil {
 		return
 	}
@@ -124,25 +126,35 @@ func createCert() (string, string, error) {
 func testProxy(t *testing.T, proxyPort, testURL string, m map[string]string) {
 	req := newRequest(testURL, m)
 	d, _ := httpproxy.NewDialer(":"+proxyPort, nil, nil, nil)
-	res, err := do(d, testURL, req)
+	resp, res, err := do(d, testURL, req)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if !maps.Equal(m, res) {
 		t.Errorf("expect %v; got %v", m, res)
 	}
+	for k, v := range m {
+		if vv := resp.Header.Get(k); vv != v {
+			t.Errorf("expect %s %s; got %s", k, v, vv)
+		}
+	}
 	u, err := url.Parse("http://localhost:" + proxyPort)
 	if err != nil {
 		t.Fatal(err)
 	}
 	d, _ = httpproxy.FromURL(u, nil)
-	res, err = do(d, testURL, req)
+	resp, res, err = do(d, testURL, req)
 	if err != nil {
 		t.Fatal(err)
 	}
 	if !maps.Equal(m, res) {
 		t.Errorf("expect %v; got %v", m, res)
 	}
+	for k, v := range m {
+		if vv := resp.Header.Get(k); vv != v {
+			t.Errorf("expect %s %s; got %s", k, v, vv)
+		}
+	}
 }
 
 func TestProxy(t *testing.T) {
@@ -265,7 +277,7 @@ func TestAuth(t *testing.T) {
 		if testcase.proxyAuth != nil {
 			d.(*httpproxy.Dialer).Auth = testcase.proxyAuth
 		}
-		res, err := do(d, ts.URL, req)
+		resp, res, err := do(d, ts.URL, req)
 		if testcase.err != "" {
 			if err == nil ||
 				!strings.Contains(err.Error(), testcase.err) {
@@ -274,8 +286,15 @@ func TestAuth(t *testing.T) {
 		} else {
 			if err != nil {
 				t.Error(i, err)
-			} else if !maps.Equal(m, res) {
-				t.Errorf("%d expect %v; got %v", i, m, res)
+			} else {
+				if !maps.Equal(m, res) {
+					t.Errorf("%d expect %v; got %v", i, m, res)
+				}
+				for k, v := range m {
+					if vv := resp.Header.Get(k); vv != v {
+						t.Errorf("expect %s %s; got %s", k, v, vv)
+					}
+				}
 			}
 		}
 	}