feat: add User-Agent to HTTP proxy client and regular observatory

Co-authored-by: RPRX <[email protected]>

app/observatory/observer.go

@@ -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)
 		}

proxy/http/client.go

@@ -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"
@@ -220,6 +221,10 @@ func setUpHTTPTunnel(ctx context.Context, dest net.Destination, target string, u
 		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")