add more examples of middleware feature for ghttp.Server; release updates

.example/net/ghttp/server/middleware/auth_exception.go

@@ -35,9 +35,6 @@ func main() {
 		g.ALL("/dashboard", func(r *ghttp.Request) {
 			r.Response.Write("dashboard")
 		})
-		g.ALL("/user", func(r *ghttp.Request) {
-			r.Response.Write("user")
-		})
 	})
 	s.SetPort(8199)
 	s.Run()

.example/net/ghttp/server/middleware/error_handling.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"net/http"
+
+	"github.com/gogf/gf/frame/g"
+	"github.com/gogf/gf/net/ghttp"
+)
+
+func MiddlewareAuth(r *ghttp.Request) {
+	token := r.Get("token")
+	if token == "123456" {
+		r.Middleware.Next()
+	} else {
+		r.Response.WriteStatus(http.StatusForbidden)
+	}
+}
+
+func MiddlewareCORS(r *ghttp.Request) {
+	r.Response.CORSDefault()
+	r.Middleware.Next()
+}
+
+func MiddlewareError(r *ghttp.Request) {
+	r.Middleware.Next()
+	if r.Response.Status >= http.StatusInternalServerError {
+		r.Response.ClearBuffer()
+		r.Response.Write("Internal error occurred, please try again later.")
+	}
+}
+
+func main() {
+	s := g.Server()
+	s.Group("/api.v2", func(g *ghttp.RouterGroup) {
+		g.Middleware(MiddlewareAuth, MiddlewareCORS, MiddlewareError)
+		g.ALL("/user/list", func(r *ghttp.Request) {
+			panic("db error: sql is xxxxxxx")
+		})
+	})
+	s.SetPort(8199)
+	s.Run()
+}

RELEASE.2.MD

@@ -28,6 +28,7 @@
 ## 功能改进
 
 1. `ghttp`
+    - 改进`Request`参数解析方式：https://goframe.org/net/ghttp/request
     - `Cookie`及`Session`的`TTL`配置数据类型修改为`time.Duration`;
     - 新增允许同时通过`Header/Cookie`传递`SessionId`；
     - 新增`ConfigFromMap/SetConfigWithMap`方法，支持通过`map`参数设置WebServer；