diff --git a/internal/protocol/bt/fetcher.go b/internal/protocol/bt/fetcher.go
index db1d8df4..c494a87e 100644
--- a/internal/protocol/bt/fetcher.go
+++ b/internal/protocol/bt/fetcher.go
@@ -10,7 +10,6 @@ import (
 	"github.com/GopeedLab/gopeed/pkg/util"
 	"github.com/anacrolix/torrent"
 	"github.com/anacrolix/torrent/metainfo"
-	"net/http"
 	"path/filepath"
 	"strings"
 	"sync"
@@ -69,9 +68,7 @@ func (f *Fetcher) initClient() (err error) {
 	cfg.Bep20 = fmt.Sprintf("-GP%s-", parseBep20())
 	cfg.ExtendedHandshakeClientVersion = fmt.Sprintf("Gopeed %s", base.Version)
 	cfg.ListenPort = f.config.ListenPort
-	if f.ctl.ProxyUrl != nil {
-		cfg.HTTPProxy = http.ProxyURL(f.ctl.ProxyUrl)
-	}
+	cfg.HTTPProxy = util.ProxyUrlToHandler(f.ctl.ProxyUrl)
 	cfg.DefaultStorage = newFileOpts(newFileClientOpts{
 		ClientBaseDir: cfg.DataDir,
 		HandleFileTorrent: func(infoHash metainfo.Hash, ft *fileTorrentImpl) {
diff --git a/internal/protocol/http/fetcher.go b/internal/protocol/http/fetcher.go
index e850c0df..46417b5d 100644
--- a/internal/protocol/http/fetcher.go
+++ b/internal/protocol/http/fetcher.go
@@ -9,6 +9,7 @@ import (
 	"github.com/GopeedLab/gopeed/internal/fetcher"
 	"github.com/GopeedLab/gopeed/pkg/base"
 	fhttp "github.com/GopeedLab/gopeed/pkg/protocol/http"
+	"github.com/GopeedLab/gopeed/pkg/util"
 	"github.com/xiaoqidun/setft"
 	"golang.org/x/sync/errgroup"
 	"io"
@@ -454,9 +455,7 @@ func (f *Fetcher) buildClient() *http.Client {
 	transport := &http.Transport{}
 	// Cookie handle
 	jar, _ := cookiejar.New(nil)
-	if f.ctl.ProxyUrl != nil {
-		transport.Proxy = http.ProxyURL(f.ctl.ProxyUrl)
-	}
+	transport.Proxy = util.ProxyUrlToHandler(f.ctl.ProxyUrl)
 	return &http.Client{
 		Transport: transport,
 		Jar:       jar,
diff --git a/pkg/download/downloader_test.go b/pkg/download/downloader_test.go
index 7836baf3..193da864 100644
--- a/pkg/download/downloader_test.go
+++ b/pkg/download/downloader_test.go
@@ -93,6 +93,11 @@ func TestDownloader_CreateWithProxy(t *testing.T) {
 		proxyCfg.Enable = false
 		return proxyCfg
 	})
+	// System proxy
+	doTestDownloaderCreateWithProxy(t, false, func(proxyCfg *DownloaderProxyConfig) *DownloaderProxyConfig {
+		proxyCfg.Scheme = "system"
+		return proxyCfg
+	})
 	// Invalid proxy scheme
 	doTestDownloaderCreateWithProxy(t, false, func(proxyCfg *DownloaderProxyConfig) *DownloaderProxyConfig {
 		proxyCfg.Scheme = ""
diff --git a/pkg/download/engine/inject/xhr/module.go b/pkg/download/engine/inject/xhr/module.go
index d91c56ac..0eedb3a7 100644
--- a/pkg/download/engine/inject/xhr/module.go
+++ b/pkg/download/engine/inject/xhr/module.go
@@ -2,9 +2,11 @@ package xhr
 
 import (
 	"bytes"
+	"errors"
 	"github.com/GopeedLab/gopeed/pkg/download/engine/inject/file"
 	"github.com/GopeedLab/gopeed/pkg/download/engine/inject/formdata"
 	"github.com/GopeedLab/gopeed/pkg/download/engine/util"
+	urlUtil "github.com/GopeedLab/gopeed/pkg/util"
 	"github.com/dop251/goja"
 	"io"
 	"mime/multipart"
@@ -203,9 +205,7 @@ func (xhr *XMLHttpRequest) Send(data goja.Value) {
 		req.Header.Set(k, v)
 	}
 	transport := &http.Transport{}
-	if xhr.proxyUrl != nil {
-		transport.Proxy = http.ProxyURL(xhr.proxyUrl)
-	}
+	transport.Proxy = urlUtil.ProxyUrlToHandler(xhr.proxyUrl)
 	client := &http.Client{
 		Transport: transport,
 		Timeout:   time.Duration(xhr.Timeout) * time.Millisecond,
@@ -213,7 +213,8 @@ func (xhr *XMLHttpRequest) Send(data goja.Value) {
 	resp, err := client.Do(req)
 	if err != nil {
 		// handle timeout error
-		if err, ok := err.(net.Error); ok && err.Timeout() {
+		var ne net.Error
+		if errors.As(err, &ne) && ne.Timeout() {
 			if xhr.Timeout > 0 {
 				xhr.Upload.callOntimeout()
 				xhr.callOntimeout()
diff --git a/pkg/download/model.go b/pkg/download/model.go
index c78521ce..d5e91c9c 100644
--- a/pkg/download/model.go
+++ b/pkg/download/model.go
@@ -141,7 +141,8 @@ func (cfg *DownloaderStoreConfig) ProxyUrl() *url.URL {
 }
 
 type DownloaderProxyConfig struct {
-	Enable bool   `json:"enable"`
+	Enable bool `json:"enable"`
+	// Scheme is the proxy scheme, e.g. http, https, socks5, but there is a special scheme "system" that means use system proxy
 	Scheme string `json:"scheme"`
 	Host   string `json:"host"`
 	Usr    string `json:"usr"`
diff --git a/pkg/util/url.go b/pkg/util/url.go
index 0a6ac190..a54c6780 100644
--- a/pkg/util/url.go
+++ b/pkg/util/url.go
@@ -2,6 +2,7 @@ package util
 
 import (
 	"encoding/base64"
+	"net/http"
 	"net/url"
 	"regexp"
 	"strings"
@@ -51,3 +52,14 @@ func BuildProxyUrl(scheme, host, usr, pwd string) *url.URL {
 		Host:   host,
 	}
 }
+
+// ProxyUrlToHandler gets the proxy handler from the proxy url.
+func ProxyUrlToHandler(proxyUrl *url.URL) func(*http.Request) (*url.URL, error) {
+	if proxyUrl == nil {
+		return nil
+	}
+	if proxyUrl.Scheme == "system" {
+		return http.ProxyFromEnvironment
+	}
+	return http.ProxyURL(proxyUrl)
+}