diff --git a/client.go b/client.go
index 0371557..bab2b60 100644
--- a/client.go
+++ b/client.go
@@ -108,7 +108,7 @@ func (obj *Client) do(ctx *Response) (err error) {
 			return nil
 		}
 		ctx.request.Response = ctx.response
-		ctx.request.Header = defaultHeaders()
+		ctx.request.Header = make(http.Header)
 		ctx.request.Header.Set("Referer", ctx.Request().URL.String())
 		for key := range ctx.request.Header {
 			if val := ctx.Request().Header.Get(key); val != "" {
diff --git a/dial.go b/dial.go
index 2bbfe5b..e4e6278 100644
--- a/dial.go
+++ b/dial.go
@@ -468,7 +468,6 @@ func (obj *Dialer) Socks5UdpProxy(ctx *Response, proxyAddress Address, remoteAdd
 }
 func (obj *Dialer) clientVerifyHttps(ctx context.Context, conn net.Conn, proxyAddress Address, remoteAddress Address) (err error) {
 	hdr := make(http.Header)
-	hdr.Set("User-Agent", tools.UserAgent)
 	if proxyAddress.User != "" && proxyAddress.Password != "" {
 		hdr.Set("Proxy-Authorization", "Basic "+tools.Base64Encode(proxyAddress.User+":"+proxyAddress.Password))
 	}
diff --git a/headers.go b/headers.go
index 64672fd..f44c19f 100644
--- a/headers.go
+++ b/headers.go
@@ -4,26 +4,12 @@ import (
 	"fmt"
 	"net/http"
 
-	"github.com/gospider007/tools"
 	"gopkg.in/errgo.v2/fmt/errors"
 )
 
-func defaultHeaders() http.Header {
-	return http.Header{
-		"User-Agent":         []string{tools.UserAgent},
-		"Connection":         []string{"keep-alive"},
-		"Accept":             []string{"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7"},
-		"Accept-Encoding":    []string{"gzip, deflate, br, zstd"},
-		"Accept-Language":    []string{tools.AcceptLanguage},
-		"Sec-Ch-Ua":          []string{tools.SecChUa},
-		"Sec-Ch-Ua-Mobile":   []string{"?0"},
-		"Sec-Ch-Ua-Platform": []string{`"Windows"`},
-	}
-}
-
 func (obj *RequestOption) initOrderHeaders() (http.Header, error) {
 	if obj.Headers == nil {
-		return defaultHeaders(), nil
+		return make(http.Header), nil
 	}
 	switch headers := obj.Headers.(type) {
 	case http.Header:
diff --git a/sepc.go b/sepc.go
index ae1f473..d0c988e 100644
--- a/sepc.go
+++ b/sepc.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"encoding/hex"
 	"errors"
-	"log"
+	"net/textproto"
 	"slices"
 	"strings"
 
@@ -30,16 +30,6 @@ func (obj *Spec) String() string {
 	return tools.BytesToString(obj.raw)
 }
 
-var defaultHeaderKeys = []string{
-	"Accept",
-	"Accept-Encoding",
-	"Accept-Language",
-	"Sec-Ch-Ua",
-	"Sec-Ch-Ua-Mobile",
-	"Sec-Ch-Ua-Platform",
-	"User-Agent",
-}
-
 type Spec struct {
 	OrderHeaders [][2]string
 	raw          []byte
@@ -91,7 +81,6 @@ func ParseGospiderSpec(value string) (*GospiderSpec, error) {
 		if spec.TLSSpec, err = ja3.ParseSpec(b); err != nil {
 			return nil, err
 		}
-		log.Print("发送请求：", spec.TLSSpec.CipherSuites)
 	}
 	if specs[1] != "" {
 		b, err := hex.DecodeString(specs[1])
@@ -127,7 +116,7 @@ func (obj *RequestOption) initSpec() error {
 		if obj.orderHeaders == nil {
 			orderData := NewOrderData()
 			for _, kv := range gospiderSpec.H1Spec.OrderHeaders {
-				if slices.Contains(defaultHeaderKeys, strings.ToLower(kv[0])) {
+				if slices.Contains(tools.DefaultHeaderKeys, kv[0]) {
 					orderData.Add(kv[0], kv[1])
 				} else {
 					orderData.Add(kv[0], nil)
@@ -140,10 +129,11 @@ func (obj *RequestOption) initSpec() error {
 		if obj.orderHeaders == nil {
 			orderData := NewOrderData()
 			for _, kv := range gospiderSpec.H2Spec.OrderHeaders {
-				if slices.Contains(defaultHeaderKeys, strings.ToLower(kv[0])) {
-					orderData.Add(kv[0], kv[1])
+				key := textproto.CanonicalMIMEHeaderKey(kv[0])
+				if slices.Contains(tools.DefaultHeaderKeys, key) {
+					orderData.Add(key, kv[1])
 				} else {
-					orderData.Add(kv[0], nil)
+					orderData.Add(key, nil)
 				}
 			}
 			obj.orderHeaders = orderData
diff --git a/test/fingerprint/ja4_test.go b/test/fingerprint/ja4_test.go
index 97334a6..fb3f394 100644
--- a/test/fingerprint/ja4_test.go
+++ b/test/fingerprint/ja4_test.go
@@ -7,7 +7,6 @@ import (
 	"testing"
 
 	"github.com/gospider007/requests"
-	"github.com/gospider007/tools"
 )
 
 func TestOrderHeaders(t *testing.T) {
@@ -15,9 +14,6 @@ func TestOrderHeaders(t *testing.T) {
 	headers := requests.NewOrderData()
 	headers.Add("Accept-Encoding", "gzip, deflate, br")
 	headers.Add("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7")
-	headers.Add("User-Agent", tools.UserAgent)
-	headers.Add("Accept-Language", tools.AcceptLanguage)
-	headers.Add("Sec-Ch-Ua", tools.SecChUa)
 	headers.Add("Sec-Ch-Ua-Mobile", "?0")
 	headers.Add("Sec-Ch-Ua-Platform", `"Windows"`)
 	resp, err := requests.Get(nil, "https://tools.scrapfly.io/api/fp/anything", requests.RequestOption{
@@ -58,9 +54,6 @@ func TestOrderHeaders2(t *testing.T) {
 	headers := map[string]any{
 		"Accept-Encoding":    "gzip, deflate, br",
 		"Accept":             "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
-		"User-Agent":         tools.UserAgent,
-		"Accept-Language":    tools.AcceptLanguage,
-		"Sec-Ch-Ua":          tools.SecChUa,
 		"Sec-Ch-Ua-Mobile":   "?0",
 		"Sec-Ch-Ua-Platform": `"Windows"`,
 	}