fix #751

add config ListenTCP4

when user want to listen on the TCP4, because now almost use the ipv4.
but default lister on the ipv6

@@ -20,13 +20,8 @@ import (
 	"net/http"
 	"net/http/fcgi"
 	"time"
-
-	"github.com/astaxie/beego/context"
 )
 
-// FilterFunc defines filter function type.
-type FilterFunc func(*context.Context)
-
 // App defines beego application with a new PatternServeMux.
 type App struct {
 	Handlers *ControllerRegistor
@@ -85,7 +80,7 @@ func (app *App) Run() {
 				if HttpsPort != 0 {
 					app.Server.Addr = fmt.Sprintf("%s:%d", HttpAddr, HttpsPort)
 				}
-				BeeLogger.Info("Running on %s", app.Server.Addr)
+				BeeLogger.Info("https server Running on %s", app.Server.Addr)
 				err := app.Server.ListenAndServeTLS(HttpCertFile, HttpKeyFile)
 				if err != nil {
 					BeeLogger.Critical("ListenAndServeTLS: ", err)
@@ -98,12 +93,29 @@ func (app *App) Run() {
 		if EnableHttpListen {
 			go func() {
 				app.Server.Addr = addr
-				BeeLogger.Info("Running on %s", app.Server.Addr)
-				err := app.Server.ListenAndServe()
-				if err != nil {
-					BeeLogger.Critical("ListenAndServe: ", err)
-					time.Sleep(100 * time.Microsecond)
-					endRunning <- true
+				BeeLogger.Info("http server Running on %s", app.Server.Addr)
+				if ListenTCP4 && HttpAddr == "" {
+					ln, err := net.Listen("tcp4", app.Server.Addr)
+					if err != nil {
+						BeeLogger.Critical("ListenAndServe: ", err)
+						time.Sleep(100 * time.Microsecond)
+						endRunning <- true
+						return
+					}
+					err = app.Server.Serve(ln)
+					if err != nil {
+						BeeLogger.Critical("ListenAndServe: ", err)
+						time.Sleep(100 * time.Microsecond)
+						endRunning <- true
+						return
+					}
+				} else {
+					err := app.Server.ListenAndServe()
+					if err != nil {
+						BeeLogger.Critical("ListenAndServe: ", err)
+						time.Sleep(100 * time.Microsecond)
+						endRunning <- true
+					}
 				}
 			}()
 		}

@@ -40,6 +40,7 @@ var (
 	EnableHttpListen       bool
 	HttpAddr               string
 	HttpPort               int
+	ListenTCP4             bool
 	EnableHttpTLS          bool
 	HttpsPort              int
 	HttpCertFile           string
@@ -309,6 +310,10 @@ func ParseConfig() (err error) {
 		HttpPort = v
 	}
 
+	if v, err := AppConfig.Bool("ListenTCP4"); err == nil {
+		ListenTCP4 = v
+	}
+
 	if v, err := AppConfig.Bool("EnableHttpListen"); err == nil {
 		EnableHttpListen = v
 	}

@@ -14,6 +14,11 @@
 
 package beego
 
+import "github.com/astaxie/beego/context"
+
+// FilterFunc defines filter function type.
+type FilterFunc func(*context.Context)
+
 // FilterRouter defines filter operation before controller handler execution.
 // it can match patterned url and do filter function when action arrives.
 type FilterRouter struct {