add sni connector

pkg/handler/http/handler.go

@@ -15,6 +15,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/asaskevich/govalidator"
 	"github.com/go-gost/gost/pkg/bypass"
 	"github.com/go-gost/gost/pkg/chain"
 	"github.com/go-gost/gost/pkg/handler"
@@ -59,12 +60,10 @@ func (h *httpHandler) Handle(ctx context.Context, conn net.Conn) {
 	defer conn.Close()
 
 	start := time.Now()
-
 	h.logger = h.logger.WithFields(map[string]interface{}{
 		"remote": conn.RemoteAddr().String(),
 		"local":  conn.LocalAddr().String(),
 	})
-
 	h.logger.Infof("%s <> %s", conn.RemoteAddr(), conn.LocalAddr())
 	defer func() {
 		h.logger.WithFields(map[string]interface{}{
@@ -87,6 +86,10 @@ func (h *httpHandler) handleRequest(ctx context.Context, conn net.Conn, req *htt
 		return
 	}
 
+	if h.md.sni && !req.URL.IsAbs() && govalidator.IsDNSName(req.Host) {
+		req.URL.Scheme = "http"
+	}
+
 	// Try to get the actual host.
 	// Compatible with GOST 2.x.
 	if v := req.Header.Get("Gost-Target"); v != "" {

pkg/handler/http/metadata.go

@@ -12,6 +12,7 @@ type metadata struct {
 	proxyAgent    string
 	retryCount    int
 	probeResist   *probeResist
+	sni           bool
 }
 
 func (h *httpHandler) parseMetadata(md md.Metadata) error {
@@ -21,6 +22,7 @@ func (h *httpHandler) parseMetadata(md md.Metadata) error {
 		probeResistKey = "probeResist"
 		knock          = "knock"
 		retryCount     = "retry"
+		sni            = "sni"
 	)
 
 	h.md.proxyAgent = md.GetString(proxyAgent)
@@ -50,6 +52,7 @@ func (h *httpHandler) parseMetadata(md md.Metadata) error {
 		}
 	}
 	h.md.retryCount = md.GetInt(retryCount)
+	h.md.sni = md.GetBool(sni)
 
 	return nil
 }