From 0c87b968aaef7b60516b5144d0689b604770b51d Mon Sep 17 00:00:00 2001
From: vgopher <61371825+vgopher@users.noreply.github.com>
Date: Thu, 8 Apr 2021 08:53:24 +0800
Subject: [PATCH] Update ch5-03-middleware.md
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修复5.3.3 示例代码
nil map panic: assignment to entry in nil map
---
 ch5-web/ch5-03-middleware.md | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/ch5-web/ch5-03-middleware.md b/ch5-web/ch5-03-middleware.md
index 15fbaaf..3d555b2 100644
--- a/ch5-web/ch5-03-middleware.md
+++ b/ch5-web/ch5-03-middleware.md
@@ -233,8 +233,10 @@ type Router struct {
 	mux map[string] http.Handler
 }
 
-func NewRouter() *Router{
-	return &Router{}
+func NewRouter() *Router {
+	return &Router{
+		mux: make(map[string]http.Handler),
+	}
 }
 
 func (r *Router) Use(m middleware) {