Go 紧急服务[::1]:46738:运行时错误:无效内存地址或零指针取消引用
有人能解释发生了什么事吗?有什么我可能遗漏的吗?我是新来的。我正在制作一个简单的CRUD应用程序,它可以编译,但是当我启动服务器时,它会给我一个运行时错误Go 紧急服务[::1]:46738:运行时错误:无效内存地址或零指针取消引用,go,Go,有人能解释发生了什么事吗?有什么我可能遗漏的吗?我是新来的。我正在制作一个简单的CRUD应用程序,它可以编译,但是当我启动服务器时,它会给我一个运行时错误 2017/10/08 11:11:59 http: multiple response.WriteHeader calls 2017/10/08 11:11:59 http: panic serving [::1]:46828: runtime error: invalid memory address or nil pointer dere
2017/10/08 11:11:59 http: multiple response.WriteHeader calls
2017/10/08 11:11:59 http: panic serving [::1]:46828: runtime error: invalid memory address or nil pointer dereference
goroutine 19 [running]:
net/http.(*conn).serve.func1(0xc42008ce60)
/home/vikram/go/src/net/http/server.go:1697 +0xd0
panic(0x740160, 0x97cc10)
/home/vikram/go/src/runtime/panic.go:491 +0x283
html/template.(*Template).escape(0x0, 0x0, 0x0)
/home/vikram/go/src/html/template/template.go:95 +0x38
html/template.(*Template).Execute(0x0, 0x94d920, 0xc420186000, 0x719e00, 0x9ab500, 0xc4201820c0, 0x0)
/home/vikram/go/src/html/template/template.go:119 +0x2f
main.indexHandler(0x9519e0, 0xc420186000, 0xc420160100)
/home/vikram/Projects/golang/src/github.com/vikramdurai/blog-app-go/main.go:188 +0x185
net/http.HandlerFunc.ServeHTTP(0x7b8da8, 0x9519e0, 0xc420186000, 0xc420160100)
/home/vikram/go/src/net/http/server.go:1918 +0x44
net/http.(*ServeMux).ServeHTTP(0x98ad20, 0x9519e0, 0xc420186000, 0xc420160100)
/home/vikram/go/src/net/http/server.go:2254 +0x130
net/http.serverHandler.ServeHTTP(0xc420087110, 0x9519e0, 0xc420186000, 0xc420160100)
/home/vikram/go/src/net/http/server.go:2619 +0xb4
net/http.(*conn).serve(0xc42008ce60, 0x9520a0, 0xc42007c280)
/home/vikram/go/src/net/http/server.go:1801 +0x71d
created by net/http.(*Server).Serve
/home/vikram/go/src/net/http/server.go:2720 +0x288
mymain.go
文件已打开。对的调用返回nil和一个错误。对t.Execute
的调用陷入恐慌,因为t
为nil
为了避免死机,请在调用http.Error后从处理程序返回
...
t, err := template.ParseFiles("index.html")
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
...
向客户端发送包含可能的实现细节的错误消息不是一个好主意。我建议如下:
...
t, err := template.ParseFiles("index.html")
if err != nil {
log.Println(err)
http.Error(w, "Internal server error", http.StatusInternalServerError)
return
}
...
我发送了错误,因为我在开发环境中。当然,我将删除生产中的错误报告。但是谢谢你的回答!:)