beego.Context.Abort return immediately

* add common 4XX/5XX HTTP exceptions

@@ -2,6 +2,8 @@ package context
 
 import (
 	"net/http"
+
+	"github.com/astaxie/beego/middleware"
 )
 
 type Context struct {
@@ -19,6 +21,13 @@ func (ctx *Context) Redirect(status int, localurl string) {
 func (ctx *Context) Abort(status int, body string) {
 	ctx.Output.SetStatus(status)
 	ctx.Output.Body([]byte(body))
+
+    if e, ok := middleware.HTTPExceptionMaps[status]; ok {
+        if len(body) >= 1 {
+            e.Description = body
+        }
+        panic(e)
+    }
 }
 
 func (ctx *Context) WriteString(content string) {

+package middleware
+
+import "fmt"
+
+type HTTPException struct {
+	StatusCode  int // http status code 4xx, 5xx
+	Description string
+}
+
+func (e *HTTPException) Error() string {
+	// return `status description`, e.g. `400 Bad Request`
+	return fmt.Sprintf("%d %s", e.StatusCode, e.Description)
+}
+
+var HTTPExceptionMaps map[int]HTTPException
+
+func init() {
+	HTTPExceptionMaps = make(map[int]HTTPException)
+
+	// Normal 4XX HTTP Status
+	HTTPExceptionMaps[400] = HTTPException{400, "Bad Request"}
+	HTTPExceptionMaps[401] = HTTPException{401, "Unauthorized"}
+	HTTPExceptionMaps[403] = HTTPException{403, "Forbidden"}
+	HTTPExceptionMaps[404] = HTTPException{404, "Not Found"}
+	HTTPExceptionMaps[405] = HTTPException{405, "Method Not Allowed"}
+
+	// Normal 5XX HTTP Status
+	HTTPExceptionMaps[500] = HTTPException{500, "Internal Server Error"}
+	HTTPExceptionMaps[502] = HTTPException{502, "Bad Gateway"}
+	HTTPExceptionMaps[503] = HTTPException{503, "Service Unavailable"}
+	HTTPExceptionMaps[504] = HTTPException{504, "Gateway Timeout"}
+}

@@ -407,6 +407,9 @@ func (p *ControllerRegistor) UrlFor(endpoint string, values ...string) string {
 func (p *ControllerRegistor) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
 	defer func() {
 		if err := recover(); err != nil {
+			if _, ok := err.(middleware.HTTPException); ok {
+				// catch intented errors, only for HTTP 4XX and 5XX
+			} else {
 				errstr := fmt.Sprint(err)
 				if handler, ok := middleware.ErrorMaps[errstr]; ok && ErrorsShow {
 					handler(rw, r)
@@ -433,6 +436,7 @@ func (p *ControllerRegistor) ServeHTTP(rw http.ResponseWriter, r *http.Request)
 					}
 				}
 			}
+		}
 	}()
 
 	starttime := time.Now()