httprouter配置NotFound [英] httprouter configuring NotFound

问题描述

我使用 httprouter 作为API和我试图找出如何处理404s。它确实在文档中说过404可以手动处理，但我不会'我真的不知道如何编写自己的自定义处理程序。

我在其他路线后尝试了以下内容...

  router.NotFound（pageNotFound）
  

但是我在调​​用router.NotFound 时收到错误没有足够的参数。

/godoc.org/github.com/julienschmidt/httprouter#Routerrel =nofollow> httprouter.Router 是结构有一个字段：

  NotFound http.HandlerFunc 
  

因此 NotFound 是 http.Han



 类型HandlerFunc func（ResponseWriter，*请求）
  

如果你想要自己定制的Not Found处理程序，你必须设置一个函数值与上面的签名。

例如：

  func MyNotFound w http.ResponseWriter，r * http.Request）{
 w.Header（）。Set（Content-Type，text / plain; ）
 w.WriteHeader（http.StatusNotFound）// StatusNotFound = 404 
 w.Write（[] byte（My own Not Found handler。））
 w.Write（[] byte（您请求的页面无法找到。））
} 
 
 var router * httprouter.Router = ... //您的路由器值
 router.NotFound = MyNotFound 
  

NotFound 函数将被 httprouter 包调用，如果你想从你的其他处理程序手动调用它，你必须通过 ResponseWriter 和 *请求 ，如下所示：

  func ResourceHandler（w http.ResponseWriter，r * http.Request）{
 exists：= ... // Find out如果请求的资源有效且可用
 if！exists {
 MyNotFound（w，r）// Pas s ResponseWriter和Request 
 //或通过路由器：
 // router.NotFound（w，r）
 return 
} 
 
 //资源存在，为它服务
 // ... 
} 
  

I'm using httprouter for an API and I'm trying to work out how to handle 404s. It does say in the docs that 404's can be handled manually but I don't really have an idea how to write my own custom handler.

I've tried the following after my other routes...

router.NotFound(pageNotFound)

But I get the error not enough arguments in call to router.NotFound.

If anyone could point me in the right direction it would be great.

解决方案

The type httprouter.Router is a struct which has a field:

NotFound http.HandlerFunc

So NotFound is an http.HandlerFunc, a function type with signature:

type HandlerFunc func(ResponseWriter, *Request)

If you want your own custom "Not Found" handler, you have to set a function value with the signature above.

For example:

func MyNotFound(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "text/plain; charset=utf-8")
    w.WriteHeader(http.StatusNotFound) // StatusNotFound = 404
    w.Write([]byte("My own Not Found handler."))
    w.Write([]byte(" The page you requested could not be found."))
}

var router *httprouter.Router = ... // Your router value
router.NotFound = MyNotFound

This NotFound function will be invoked by the httprouter package. If you would want to call it manually from one of your other handlers, you would have to pass a ResponseWriter and a *Request to it, something like this:

func ResourceHandler(w http.ResponseWriter, r *http.Request) {
    exists := ... // Find out if requested resource is valid and available
    if !exists {
        MyNotFound(w, r) // Pass ResponseWriter and Request
        // Or via the Router:
        // router.NotFound(w, r)
        return
    }

    // Resource exists, serve it
    // ...
}

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