令ws在fallback失败给出具体原因;fix #194

advLayer/ws/server.go

@@ -23,7 +23,7 @@ var (
 	upgradeBs    = []byte("Upgrade")
 )
 
-//implements advLayer.SingleServer
+// implements advLayer.SingleServer
 type Server struct {
 	Creator
 	UseEarlyData   bool
@@ -123,6 +123,7 @@ func (s *Server) Handshake(underlay net.Conn) (net.Conn, error) {
 	optionalFirstBuffer := rp.WholeRequestBuf
 
 	notWsRequest := false
+	notReason := ""
 
 	//因为 gobwas 会先自行给错误的连接 返回 错误信息，而这不行，所以我们先过滤一遍。
 	//header 我们只过滤一个 connection 就行. 要是怕攻击者用 “对的path,method 和错误的header” 进行探测,
@@ -130,6 +131,7 @@ func (s *Server) Handshake(underlay net.Conn) (net.Conn, error) {
 
 	if rp.Method != "GET" || s.Thepath != rp.Path || len(rp.Headers) == 0 {
 		notWsRequest = true
+		notReason = `rp.Method != "GET" || s.Thepath != rp.Path || len(rp.Headers) == 0`
 
 	} else {
 		hasUpgrade := false
@@ -147,6 +149,7 @@ func (s *Server) Handshake(underlay net.Conn) (net.Conn, error) {
 		}
 		if !hasUpgrade {
 			notWsRequest = true
+			notReason = "has no upgrade field"
 		}
 
 	}
@@ -157,6 +160,7 @@ func (s *Server) Handshake(underlay net.Conn) (net.Conn, error) {
 			H1RequestBuf: optionalFirstBuffer,
 			Path:         rp.Path,
 			Method:       rp.Method,
+			Reason:       notReason,
 		}, httpLayer.ErrShouldFallback
 	}
 
@@ -279,6 +283,7 @@ func (s *Server) Handshake(underlay net.Conn) (net.Conn, error) {
 			H1RequestBuf: optionalFirstBuffer,
 			Path:         rp.Path,
 			Method:       rp.Method,
+			Reason:       err.Error(),
 		}, httpLayer.ErrShouldFallback
 	}
 

cmd/verysimple/main.go

@@ -273,12 +273,12 @@ func mainFunc() (result int) {
 	//load inServers and RoutingEnv
 	switch configMode {
 	case proxy.SimpleMode:
-		var theServer proxy.Server
-		result, theServer = loadSimpleServer()
+		//var theServer proxy.Server
+		result, _ = loadSimpleServer()
 		if result < 0 {
 			return result
 		}
-		allServers = append(allServers, theServer)
+		//allServers = append(allServers, theServer)	//loadSimpleServer 已经加过一遍了
 
 	case proxy.StandardMode:
 

httpLayer/fallback.go

@@ -44,6 +44,7 @@ type FallbackMeta struct {
 	Path         string
 	Method       string
 	IsH2         bool
+	Reason       string
 
 	H2Request *http.Request
 }
@@ -52,12 +53,12 @@ func getfallbacktype_byindex(i int) byte {
 	return 1 << (i + 1)
 }
 
-//判断 Fallback.SupportType 返回的 数值 是否具有特定的Fallback类型
+// 判断 Fallback.SupportType 返回的 数值 是否具有特定的Fallback类型
 func HasFallbackType(ftype, b byte) bool {
 	return ftype&b > 0
 }
 
-//实现 Fallback. 这里的fallback只与http协议有关，所以只能按path,alpn 和 sni 进行分类
+// 实现 Fallback. 这里的fallback只与http协议有关，所以只能按path,alpn 和 sni 进行分类
 type Fallback interface {
 	GetFallback(ftype byte, params ...string) *FallbackResult
 	SupportType() byte //参考Fallback_开头的常量。如果支持多个，则返回它们 按位与 的结果

main.go

@@ -414,6 +414,7 @@ func handleNewIncomeConnection(inServer proxy.Server, defaultClientForThis proxy
 					ce.Write(
 						zap.String("handler", inServer.AddrStr()),
 						zap.String("advLayer", adv),
+						zap.String("Reason", meta.Reason),
 						zap.String("validPath", advSer.GetPath()),
 						zap.String("gotMethod", meta.Method),
 						zap.String("gotPath", meta.Path),