diff --git a/eBook/15.2.md b/eBook/15.2.md
index 8648677..dbbe227 100644
--- a/eBook/15.2.md
+++ b/eBook/15.2.md
@@ -112,5 +112,5 @@ func (obj *Typ) ServeHTTP(w http.ResponseWriter, req *http.Request) {
## 链接
- [目录](directory.md)
-- 上一章：[tcp服务器](15.1.md)
+- 上一节：[tcp服务器](15.1.md)
- 下一节：[访问并读取页面数据](15.3.md)
diff --git a/eBook/15.3.md b/eBook/15.3.md
index c4e582e..7e5c8eb 100644
--- a/eBook/15.3.md
+++ b/eBook/15.3.md
@@ -150,5 +150,5 @@ go为所有的HTTP状态码定义了常量，比如：
## 链接
- [目录](directory.md)
-- 上一章：[一个简单的网页服务器](15.2.md)
+- 上一节：[一个简单的网页服务器](15.2.md)
- 下一节：[写一个简单的网页应用](15.4.md)
diff --git a/eBook/15.4.md b/eBook/15.4.md
index d70f068..1b9413f 100644
--- a/eBook/15.4.md
+++ b/eBook/15.4.md
@@ -62,5 +62,5 @@ func main() {
- [目录](directory.md)
-- 上一章：[访问并读取页面](15.3.md)
-- 下一节：[常见的陷阱与错误](16.0.md)
+- 上一节：[访问并读取页面](15.3.md)
+- 下一节：[确保网页应用健壮](15.5.md)
diff --git a/eBook/15.5.md b/eBook/15.5.md
new file mode 100644
index 0000000..96106e8
--- /dev/null
+++ b/eBook/15.5.md
@@ -0,0 +1,98 @@
+# 15.5 确保网页应用健壮
+
+当网页应用的处理函数发生 panic，服务器会简单地终止运行。这可不妙：网页服务器必须是足够健壮的程序，能够承受任何可能的突发问题。
+
+首先能想到的是在每个处理函数中使用 `defer/recover`，不过这样会产生太多的重复代码。[13.5节](13.5.md) 使用闭包的错误处理模式是更优雅的方案。我们把这种机制应用到前一章的简单网页服务器上。实际上，它可以被简单地应用到任何网页服务器程序中。
+
+为增强代码可读性，我们为页面处理函数创建一个类型：
+```go
+type HandleFnc func(http.ResponseWriter, *http.Request)
+```
+
+我们的错误处理函数应用了[13.5节](13.5.md) 的模式，成为 `logPanics` 函数：
+```go
+func logPanics(function HandleFnc) HandleFnc {
+ return func(writer http.ResponseWriter, request *http.Request) {
+ defer func() {
+ if x := recover(); x != nil {
+ log.Printf("[%v] caught panic: %v", request.RemoteAddr, x)
+ }
+ }()
+ function(writer, request)
+ }
+}
+```
+
+然后我们用 `logPanics` 来包装对处理函数的调用：
+```go
+http.HandleFunc("/test1", logPanics(SimpleServer))
+http.HandleFunc("/test2", logPanics(FormServer))
+```
+
+处理函数现在可以恢复 panic 调用，类似[13.5节](13.5.md) 中的错误检测函数。完整代码如下：
+
+示例 15.11 [robust_webserver.go](examples/chapter_15/robust_webserver.go)
+
+```go
+package main
+
+import (
+ "io"
+ "log"
+ "net/http"
+)
+
+const form = ``
+
+type HandleFnc func(http.ResponseWriter, *http.Request)
+
+/* handle a simple get request */
+func SimpleServer(w http.ResponseWriter, request *http.Request) {
+ io.WriteString(w, "hello, world
")
+}
+
+/* handle a form, both the GET which displays the form
+ and the POST which processes it.*/
+func FormServer(w http.ResponseWriter, request *http.Request) {
+ w.Header().Set("Content-Type", "text/html")
+ switch request.Method {
+ case "GET":
+ /* display the form to the user */
+ io.WriteString(w, form)
+ case "POST":
+ /* handle the form data, note that ParseForm must
+ be called before we can extract form data*/
+ //request.ParseForm();
+ //io.WriteString(w, request.Form["in"][0])
+ io.WriteString(w, request.FormValue("in"))
+ }
+}
+
+func main() {
+ http.HandleFunc("/test1", logPanics(SimpleServer))
+ http.HandleFunc("/test2", logPanics(FormServer))
+ if err := http.ListenAndServe(":8088", nil); err != nil {
+ panic(err)
+ }
+}
+
+func logPanics(function HandleFnc) HandleFnc {
+ return func(writer http.ResponseWriter, request *http.Request) {
+ defer func() {
+ if x := recover(); x != nil {
+ log.Printf("[%v] caught panic: %v", request.RemoteAddr, x)
+ }
+ }()
+ function(writer, request)
+ }
+}
+```
+
+## 链接
+
+- [目录](directory.md)
+- 上一节：[写一个简单的网页应用](15.4.md)
+- 下一节：[用模板写网页应用](15.6.md)
diff --git a/eBook/examples/chapter_15/robust_webserver.go b/eBook/examples/chapter_15/robust_webserver.go
new file mode 100644
index 0000000..f40d08b
--- /dev/null
+++ b/eBook/examples/chapter_15/robust_webserver.go
@@ -0,0 +1,56 @@
+// robust_webserver.go
+package main
+
+import (
+ "net/http"
+ "io"
+ "log"
+)
+
+const form = ``
+
+type HandleFnc func(http.ResponseWriter, *http.Request)
+
+/* handle a simple get request */
+func SimpleServer(w http.ResponseWriter, request *http.Request) {
+ io.WriteString(w, "hello, world
")
+}
+
+/* handle a form, both the GET which displays the form
+ and the POST which processes it.*/
+func FormServer(w http.ResponseWriter, request *http.Request) {
+ w.Header().Set("Content-Type", "text/html")
+ switch request.Method {
+ case "GET":
+ /* display the form to the user */
+ io.WriteString(w, form)
+ case "POST":
+ /* handle the form data, note that ParseForm must
+ be called before we can extract form data*/
+ //request.ParseForm();
+ //io.WriteString(w, request.Form["in"][0])
+ io.WriteString(w, request.FormValue("in"))
+ }
+}
+
+func main() {
+ http.HandleFunc("/test1", logPanics(SimpleServer))
+ http.HandleFunc("/test2", logPanics(FormServer))
+ if err := http.ListenAndServe(":8088", nil); err != nil {
+ panic(err)
+ }
+}
+
+func logPanics(function HandleFnc) HandleFnc {
+ return func(writer http.ResponseWriter, request *http.Request) {
+ defer func() {
+ if x := recover(); x != nil {
+ log.Printf("[%v] caught panic: %v", request.RemoteAddr, x)
+ }
+ }()
+ function(writer, request)
+ }
+}