fixed set http response header bugs.

BUG出现在net/http中，fasthttp没有这个问题。
问题总结：
Set Header -> Set StatusCode , is right.

ActionResult/IActionResult.go

@@ -13,6 +13,7 @@ type IActionResult interface {
 func writeContentType(w http.ResponseWriter, value []string) {
 	header := w.Header()
 	if val := header["Content-Type"]; len(val) == 0 {
-		header["Content-Type"] = value
+		w.Header().Set("content-type", value[0])
+		//header["Content-Type"] = value
 	}
 }

Context/HttpContext.go

@@ -352,15 +352,14 @@ func bodyAllowedForStatus(status int) bool {
 
 // ActionResult writes the response headers and calls render.ActionResult to render data.
 func (c *HttpContext) Render(code int, r ActionResult.IActionResult) {
-	c.Status(code)
-
 	if !bodyAllowedForStatus(code) {
 		r.WriteContentType(c.Response)
 		c.Response.WriteHeaderNow()
 		return
 	}
 
-	if err := r.Render(c.Response); err != nil {
+	if err := r.Render(c.Response.ResponseWriter); err != nil {
 		panic(err)
 	}
+	c.Status(code)
 }

Examples/SimpleWeb/main.go

@@ -21,6 +21,7 @@ func main() {
 //* Create the builder of Web host
 func CreateCustomBuilder() *YoyoGo.HostBuilder {
 	return YoyoGo.NewWebHostBuilder().
+		//UseHttp().
 		UseFastHttp().
 		//UseServer(YoyoGo.DefaultHttps(":8080", "./Certificate/server.pem", "./Certificate/server.key")).
 		Configure(func(app *YoyoGo.ApplicationBuilder) {

Framework/Version.go

@@ -1,5 +1,5 @@
 package YoyoGo
 
 const (
-	Version = "v1.4.9.2 pre-release"
+	Version = "v1.4.9.3 pre-release"
 )

Router/MvcRouterHandler.go

@@ -5,7 +5,6 @@ import (
 	"github.com/maxzhang1985/yoyogo/Context"
 	"github.com/maxzhang1985/yoyogo/Controller"
 	"net/http"
-	"reflect"
 	"strings"
 )
 
@@ -70,10 +69,10 @@ func (handler *MvcRouterHandler) Invoke(ctx *Context.HttpContext, pathComponents
 
 }
 
-func findControllerAction() {
-	t := reflect.ValueOf(method.Object)
-	method.methodInfo = t.MethodByName(method.MethodName)
-	if !method.methodInfo.IsValid() {
-		return false
-	}
-}
+//func findControllerAction() {
+//	t := reflect.ValueOf(method.Object)
+//	method.methodInfo = t.MethodByName(method.MethodName)
+//	if !method.methodInfo.IsValid() {
+//		return false
+//	}
+//}