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Xray-core: Dynamic Chrome User-Agent for all HTTP requests by default (overwriteable through config) (#5658)

Browse Source 
https://github.com/XTLS/Xray-core/issues/4996#issuecomment-3855274627
https://github.com/XTLS/Xray-core/pull/5658#issuecomment-3857332687

---------

Co-authored-by: RPRX <63339210+RPRX@users.noreply.github.com>
Co-authored-by: Fangliding <63339210+Fangliding@users.noreply.github.com>
This commit is contained in:
Copilot
2026-02-06 01:33:30 +00:00
committed by RPRX
parent 8c3f246dcb
commit b7a22c729b
13 changed files with 63 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
app/dns/nameserver_doh.go
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@@ -214,6 +214,7 @@ func (s *DoHNameServer) dohHTTPSContext(ctx context.Context, b []byte) ([]byte,
req.Header.Add("Accept", "application/dns-message")
req.Header.Add("Content-Type", "application/dns-message")
req.Header.Set("User-Agent", utils.ChromeUA)
req.Header.Set("X-Padding", utils.H2Base62Pad(crypto.RandBetween(100, 1000)))
hc := s.httpClient

2
app/observatory/burst/ping.go
View File

@@ -7,6 +7,7 @@ import (
"time"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/features/routing"
"github.com/xtls/xray-core/transport/internet/tagged"
)
@@ -61,6 +62,7 @@ func (s *pingClient) MeasureDelay(httpMethod string) (time.Duration, error) {
if err != nil {
return rttFailed, err
}
req.Header.Set("User-Agent", utils.ChromeUA)
start := time.Now()
resp, err := s.httpClient.Do(req)

5
app/observatory/observer.go
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@@ -15,6 +15,7 @@ import (
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal/done"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/extension"
"github.com/xtls/xray-core/features/outbound"
@@ -162,7 +163,9 @@ func (o *Observer) probe(outbound string) ProbeResult {
if o.config.ProbeUrl != "" {
probeURL = o.config.ProbeUrl
}
response, err := httpClient.Get(probeURL)
req, _ := http.NewRequest(http.MethodGet, probeURL, nil)
req.Header.Set("User-Agent", utils.ChromeUA)
response, err := httpClient.Do(req)
if err != nil {
return errors.New("outbound failed to relay connection").Base(err)
}

28
common/utils/browser.go Normal file
View File

@@ -0,0 +1,28 @@
package utils
import (
"math/rand"
"strconv"
"time"
"github.com/klauspost/cpuid/v2"
)
func ChromeVersion() int {
// Use only CPU info as seed for PRNG
seed := int64(cpuid.CPU.Family + cpuid.CPU.Model + cpuid.CPU.PhysicalCores + cpuid.CPU.LogicalCores + cpuid.CPU.CacheLine)
rng := rand.New(rand.NewSource(seed))
// Start from Chrome 144 released on 2026.1.13
releaseDate := time.Date(2026, 1, 13, 0, 0, 0, 0, time.UTC)
version := 144
now := time.Now()
// Each version has random 25-45 day interval
for releaseDate.Before(now) {
releaseDate = releaseDate.AddDate(0, 0, rng.Intn(21)+25)
version++
}
return version - 1
}
// ChromeUA provides default browser User-Agent based on CPU-seeded PRNG.
var ChromeUA = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/" + strconv.Itoa(ChromeVersion()) + ".0.0.0 Safari/537.36"

2
go.mod
View File

@@ -9,6 +9,7 @@ require (
github.com/golang/mock v1.7.0-rc.1
github.com/google/go-cmp v0.7.0
github.com/gorilla/websocket v1.5.3
github.com/klauspost/cpuid/v2 v2.0.12
github.com/miekg/dns v1.1.72
github.com/pelletier/go-toml v1.9.5
github.com/pires/go-proxyproto v0.9.2
@@ -39,7 +40,6 @@ require (
github.com/google/btree v1.1.2 // indirect
github.com/juju/ratelimit v1.0.2 // indirect
github.com/klauspost/compress v1.17.4 // indirect
github.com/klauspost/cpuid/v2 v2.0.12 // indirect
github.com/kr/text v0.2.0 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/quic-go/qpack v0.6.0 // indirect

8
infra/conf/transport_authenticators.go
View File

@@ -4,6 +4,7 @@ import (
"sort"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/transport/internet/headers/http"
"github.com/xtls/xray-core/transport/internet/headers/noop"
"google.golang.org/protobuf/proto"
@@ -40,11 +41,8 @@ func (v *AuthenticatorRequest) Build() (*http.RequestConfig, error) {
Value: []string{"www.baidu.com", "www.bing.com"},
},
{
Name: "User-Agent",
Value: []string{
"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36",
"Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_2 like Mac OS X) AppleWebKit/601.1 (KHTML, like Gecko) CriOS/53.0.2785.109 Mobile/14A456 Safari/601.1.46",
},
Name: "User-Agent",
Value: []string{utils.ChromeUA},
},
{
Name: "Accept-Encoding",

4
proxy/http/client.go
View File

@@ -21,6 +21,7 @@ import (
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/signal"
"github.com/xtls/xray-core/common/task"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/features/policy"
"github.com/xtls/xray-core/transport"
@@ -219,6 +220,9 @@ func setUpHTTPTunnel(ctx context.Context, dest net.Destination, target string, u
for _, h := range header {
req.Header.Set(h.Key, h.Value)
}
if req.Header.Get("User-Agent") == "" {
req.Header.Set("User-Agent", utils.ChromeUA)
}
connectHTTP1 := func(rawConn net.Conn) (net.Conn, error) {
req.Header.Set("Proxy-Connection", "Keep-Alive")

7
transport/internet/grpc/dial.go
View File

@@ -10,6 +10,7 @@ import (
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/session"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/grpc/encoding"
"github.com/xtls/xray-core/transport/internet/reality"
@@ -167,9 +168,11 @@ func getGrpcClient(ctx context.Context, dest net.Destination, streamSettings *in
dialOptions = append(dialOptions, grpc.WithInitialWindowSize(grpcSettings.InitialWindowsSize))
}
if grpcSettings.UserAgent != "" {
dialOptions = append(dialOptions, grpc.WithUserAgent(grpcSettings.UserAgent))
userAgent := grpcSettings.UserAgent
if userAgent == "" {
userAgent = utils.ChromeUA
}
dialOptions = append(dialOptions, grpc.WithUserAgent(userAgent))
var grpcDestHost string
if dest.Address.Family().IsDomain() {

4
transport/internet/httpupgrade/dialer.go
View File

@@ -10,6 +10,7 @@ import (
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/transport/internet"
"github.com/xtls/xray-core/transport/internet/stat"
"github.com/xtls/xray-core/transport/internet/tls"
@@ -86,6 +87,9 @@ func dialhttpUpgrade(ctx context.Context, dest net.Destination, streamSettings *
for key, value := range transportConfiguration.Header {
AddHeader(req.Header, key, value)
}
if req.Header.Get("User-Agent") == "" {
req.Header.Set("User-Agent", utils.ChromeUA)
}
req.Header.Set("Connection", "Upgrade")
req.Header.Set("Upgrade", "websocket")

3
transport/internet/reality/reality.go
View File

@@ -27,6 +27,7 @@ import (
"github.com/xtls/xray-core/common/crypto"
"github.com/xtls/xray-core/common/errors"
"github.com/xtls/xray-core/common/net"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/core"
"github.com/xtls/xray-core/transport/internet/tls"
"golang.org/x/crypto/hkdf"
@@ -222,7 +223,7 @@ func UClient(c net.Conn, config *Config, ctx context.Context, dest net.Destinati
if req == nil {
return
}
req.Header.Set("User-Agent", fingerprint.Client) // TODO: User-Agent map
req.Header.Set("User-Agent", utils.ChromeUA)
if first && config.Show {
fmt.Printf("REALITY localAddr: %v\treq.UserAgent(): %v\n", localAddr, req.UserAgent())
}

4
transport/internet/splithttp/config.go
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@@ -6,6 +6,7 @@ import (
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/crypto"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/transport/internet"
)
@@ -47,6 +48,9 @@ func (c *Config) GetRequestHeader() http.Header {
for k, v := range c.Headers {
header.Add(k, v)
}
if header.Get("User-Agent") == "" {
header.Set("User-Agent", utils.ChromeUA)
}
return header
}

1
transport/internet/tls/ech.go
View File

@@ -257,6 +257,7 @@ func dnsQuery(server string, domain string, sockopt *internet.SocketConfig) ([]b
}
req.Header.Set("Accept", "application/dns-message")
req.Header.Set("Content-Type", "application/dns-message")
req.Header.Set("User-Agent", utils.ChromeUA)
req.Header.Set("X-Padding", utils.H2Base62Pad(crypto.RandBetween(100, 1000)))
resp, err := client.Do(req)

4
transport/internet/websocket/config.go
View File

@@ -4,6 +4,7 @@ import (
"net/http"
"github.com/xtls/xray-core/common"
"github.com/xtls/xray-core/common/utils"
"github.com/xtls/xray-core/transport/internet"
)
@@ -23,6 +24,9 @@ func (c *Config) GetRequestHeader() http.Header {
for k, v := range c.Header {
header.Add(k, v)
}
if header.Get("User-Agent") == "" {
header.Set("User-Agent", utils.ChromeUA)
}
return header
}