Improve sniffer

common/sniff/http.go

@@ -3,10 +3,12 @@ package sniff
 import (
 	std_bufio "bufio"
 	"context"
+	"errors"
 	"io"
 
 	"github.com/sagernet/sing-box/adapter"
 	C "github.com/sagernet/sing-box/constant"
+	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	"github.com/sagernet/sing/protocol/http"
 )
@@ -14,7 +16,11 @@ import (
 func HTTPHost(_ context.Context, metadata *adapter.InboundContext, reader io.Reader) error {
 	request, err := http.ReadRequest(std_bufio.NewReader(reader))
 	if err != nil {
-		return err
+		if errors.Is(err, io.ErrUnexpectedEOF) {
+			return E.Cause1(ErrNeedMoreData, err)
+		} else {
+			return err
+		}
 	}
 	metadata.Protocol = C.ProtocolHTTP
 	metadata.Domain = M.ParseSocksaddr(request.Host).AddrString()