Allow to use fastcgi via standard io.

@@ -55,15 +55,24 @@ func (app *App) Run() {
 	endRunning := make(chan bool, 1)
 
 	if UseFcgi {
-		if HttpPort == 0 {
-			l, err = net.Listen("unix", addr)
+		if UseStdIo {
+			err = fcgi.Serve(nil, app.Handlers) // standard I/O
+			if err == nil {
+				BeeLogger.Info("Use FCGI via standard I/O")
+			} else {
+				BeeLogger.Info("Cannot use FCGI via standard I/O", err)
+			}
 		} else {
-			l, err = net.Listen("tcp", addr)
+			if HttpPort == 0 {
+				l, err = net.Listen("unix", addr)
+			} else {
+				l, err = net.Listen("tcp", addr)
+			}
+			if err != nil {
+				BeeLogger.Critical("Listen: ", err)
+			}
+			err = fcgi.Serve(l, app.Handlers)
 		}
-		if err != nil {
-			BeeLogger.Critical("Listen: ", err)
-		}
-		err = fcgi.Serve(l, app.Handlers)
 	} else {
 		app.Server.Addr = addr
 		app.Server.Handler = app.Handlers

@@ -61,6 +61,7 @@ var (
 	SessionAutoSetCookie   bool             // auto setcookie
 	SessionDomain          string           // the cookie domain default is empty
 	UseFcgi                bool
+	UseStdIo               bool
 	MaxMemory              int64
 	EnableGzip             bool // flag of enable gzip
 	DirectoryIndex         bool // flag of display directory index. default is false.
@@ -241,6 +242,7 @@ func init() {
 	SessionAutoSetCookie = true
 
 	UseFcgi = false
+	UseStdIo = false
 
 	MaxMemory = 1 << 26 //64MB