diff --git a/pkg/download/engine/engine.go b/pkg/download/engine/engine.go
index ac0db488..1809e542 100644
--- a/pkg/download/engine/engine.go
+++ b/pkg/download/engine/engine.go
@@ -145,6 +145,10 @@ func NewEngine(cfg *Config) *Engine {
 		if err := runtime.Set("global", runtime.GlobalObject()); err != nil {
 			return
 		}
+		// polyfill window
+		if err := runtime.Set("window", runtime.GlobalObject()); err != nil {
+			return
+		}
 		// polyfill window.location
 		if _, err := runtime.RunString("global.location = new URL('http://localhost');"); err != nil {
 			return
diff --git a/pkg/download/engine/engine_test.go b/pkg/download/engine/engine_test.go
index 61443bd3..a1763f42 100644
--- a/pkg/download/engine/engine_test.go
+++ b/pkg/download/engine/engine_test.go
@@ -80,6 +80,30 @@ async function testFormData(file){
 	return await resp.json();
 }
 
+function testHeader(){
+	return new Promise((resolve, reject) => {
+		const xhr = new XMLHttpRequest();
+		xhr.open('GET', host+'/header');
+		xhr.setRequestHeader('X-Gopeed-Test', 'test1');
+		xhr.setRequestHeader('x-gopeed-test', 'test2');
+		xhr.setRequestHeader('x-Gopeed-test', 'test3');
+		xhr.onload = function(){
+			const testHeader1 = xhr.getResponseHeader("X-Gopeed-Test");
+		    const testHeader2 = xhr.getResponseHeader("x-gopeed-test");
+		    const testHeader3 = xhr.getResponseHeader("x-Gopeed-test");
+			const expect = 'test1, test2, test3';
+			const all = xhr.getAllResponseHeaders();
+			if(testHeader1 === expect && testHeader2 === expect && testHeader3 === expect 
+				&& all.includes('X-Gopeed-Test: '+expect)){
+				resolve();
+			}else{
+				reject();
+			}
+		};
+		xhr.send();
+	});
+}
+
 function testProgress(){
 	return new Promise((resolve, reject) => {
 		const xhr = new XMLHttpRequest();
@@ -190,14 +214,19 @@ function testTimeout(){
 		}
 	}()
 
+	_, err = callTestFun(engine, "testHeader")
+	if err != nil {
+		t.Fatal("header test failed", err)
+	}
+
 	_, err = callTestFun(engine, "testProgress")
 	if err != nil {
-		t.Fatal("progress test failed")
+		t.Fatal("progress test failed", err)
 	}
 
 	_, err = callTestFun(engine, "testAbort")
 	if err != nil {
-		t.Fatal("abort test failed")
+		t.Fatal("abort test failed", err)
 	}
 
 	_, err = callTestFun(engine, "testTimeout")
@@ -328,6 +357,15 @@ func startServer() net.Listener {
 		w.WriteHeader(http.StatusOK)
 		w.Write([]byte("ok"))
 	})
+	mux.HandleFunc("/header", func(w http.ResponseWriter, r *http.Request) {
+		for k, v := range r.Header {
+			if strings.HasPrefix(k, "X-Gopeed") {
+				w.Header().Set(k, strings.Join(v, ", "))
+			}
+		}
+		w.WriteHeader(http.StatusOK)
+		w.Write([]byte("ok"))
+	})
 	mux.HandleFunc("/text", func(w http.ResponseWriter, r *http.Request) {
 		buf, _ := io.ReadAll(r.Body)
 		w.WriteHeader(http.StatusOK)
diff --git a/pkg/download/engine/inject/xhr/module.go b/pkg/download/engine/inject/xhr/module.go
index dd6e0a77..292041c2 100644
--- a/pkg/download/engine/inject/xhr/module.go
+++ b/pkg/download/engine/inject/xhr/module.go
@@ -12,6 +12,7 @@ import (
 	"net"
 	"net/http"
 	"net/url"
+	"strings"
 	"time"
 )
 
@@ -118,8 +119,8 @@ type XMLHttpRequestUpload struct {
 type XMLHttpRequest struct {
 	method          string
 	url             string
-	requestHeaders  map[string]string
-	responseHeaders map[string]string
+	requestHeaders  http.Header
+	responseHeaders http.Header
 	aborted         bool
 	proxyHandler    func(r *http.Request) (*url.URL, error)
 
@@ -137,13 +138,13 @@ type XMLHttpRequest struct {
 func (xhr *XMLHttpRequest) Open(method, url string) {
 	xhr.method = method
 	xhr.url = url
-	xhr.requestHeaders = make(map[string]string)
-	xhr.responseHeaders = make(map[string]string)
+	xhr.requestHeaders = make(http.Header)
+	xhr.responseHeaders = make(http.Header)
 	xhr.doReadystatechange(1)
 }
 
 func (xhr *XMLHttpRequest) SetRequestHeader(key, value string) {
-	xhr.requestHeaders[key] = value
+	xhr.requestHeaders.Add(key, value)
 }
 
 func (xhr *XMLHttpRequest) Send(data goja.Value) {
@@ -194,15 +195,13 @@ func (xhr *XMLHttpRequest) Send(data goja.Value) {
 		xhr.callOnerror()
 		return
 	}
+	req.Header = xhr.requestHeaders
 	if contentType != "" {
 		req.Header.Set("Content-Type", contentType)
 	}
 	if contentLength > 0 {
 		req.ContentLength = contentLength
 	}
-	for k, v := range xhr.requestHeaders {
-		req.Header.Set(k, v)
-	}
 	transport := &http.Transport{
 		Proxy: xhr.proxyHandler,
 	}
@@ -230,9 +229,7 @@ func (xhr *XMLHttpRequest) Send(data goja.Value) {
 	if !xhr.aborted {
 		xhr.Upload.callOnload()
 	}
-	for k, v := range resp.Header {
-		xhr.responseHeaders[k] = v[0]
-	}
+	xhr.responseHeaders = resp.Header
 	xhr.Status = resp.StatusCode
 	xhr.StatusText = resp.Status
 	xhr.doReadystatechange(2)
@@ -261,7 +258,7 @@ func (xhr *XMLHttpRequest) Abort() {
 }
 
 func (xhr *XMLHttpRequest) GetResponseHeader(key string) string {
-	return xhr.responseHeaders[key]
+	return strings.Join(xhr.responseHeaders.Values(key), ", ")
 }
 
 func (xhr *XMLHttpRequest) GetAllResponseHeaders() string {
@@ -269,7 +266,7 @@ func (xhr *XMLHttpRequest) GetAllResponseHeaders() string {
 	for k, v := range xhr.responseHeaders {
 		buf.WriteString(k)
 		buf.WriteString(": ")
-		buf.WriteString(v)
+		buf.WriteString(strings.Join(v, ", "))
 		buf.WriteString("\r\n")
 	}
 	return buf.String()
diff --git a/pkg/download/extension_test.go b/pkg/download/extension_test.go
index 59707722..a7c4a504 100644
--- a/pkg/download/extension_test.go
+++ b/pkg/download/extension_test.go
@@ -238,7 +238,7 @@ func TestDownloader_Extension_OnError(t *testing.T) {
 		select {
 		case err = <-errCh:
 			break
-		case <-time.After(time.Second * 10):
+		case <-time.After(time.Second * 30):
 			err = errors.New("timeout")
 		}