英文:
setup 404 NotFound handler on a gorilla mux router
问题
这是我用Go语言和gorilla mux包编写的一个小型演示Web服务器的代码：
package main
import (
"fmt"
"github.com/gorilla/mux"
"net/http"
)
func handler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
fmt.Fprintf(w, "你好，我喜欢%s！", vars["username"])
}
func homeHandler(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
errorHandler(w, r, http.StatusNotFound)
return
}
vars := mux.Vars(r)
fmt.Fprintf(w, "你好，我喜欢%s！", vars["username"])
}
func main() {
r := mux.NewRouter()
r.HandleFunc("/help/{username}/", handler)
http.Handle("/", r)
http.ListenAndServe(":8080", nil)
}
但是我找不到如何实现自定义404页面的方法。
但是我不能使用r.HandleFunc("/",...)，因为它会太贪婪。
英文:
Here is my code about a small demonstration webserver written with the Go language and the gorilla mux package :
package main
import (
"fmt"
"github.com/gorilla/mux"
"net/http"
)
func handler(w http.ResponseWriter, r *http.Request) {
vars := mux.Vars(r)
fmt.Fprintf(w, "Hi there, I love %s!", vars["username"])
}
func homeHandler(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
errorHandler(w, r, http.StatusNotFound)
return
}
vars := mux.Vars(r)
fmt.Fprintf(w, "Hi there, I love %s!", vars["username"])
}
func main() {
r := mux.NewRouter()
r.HandleFunc("/help/{username}/", handler)
http.Handle("/", r)
http.ListenAndServe(":8080", nil)
}
But I don't find a way on how to implement a custom 404 page.
But I can't make a r.HandleFunc("/",...) but it will be too greedy.
答案1
得分: 14
Router导出了一个NotFoundHandler字段，你可以将其设置为自定义的处理程序。
r := mux.NewRouter()
r.NotFoundHandler = MyCustom404Handler
英文:
The Router exports a NotFoundHandler field which you can set to your custom handler.
r := mux.NewRouter()
r.NotFoundHandler = MyCustom404Handler
答案2
得分: 11
有时候，你会花费很多时间构建一个中间件堆栈，它可以执行许多任务，比如记录日志、发送指标等等。而默认的404处理程序会跳过所有的中间件。
我通过重新设置默认的404处理程序来解决这个问题，像这样：
router := mux.NewRouter()
router.Use(someMiddleware())
// 重新定义默认的NotFound处理程序
router.NotFoundHandler = router.NewRoute().HandlerFunc(http.NotFound).GetHandler()
现在，404默认处理程序也会经过所有的中间件。
英文:
Sometimes, you spend a lot of time building a stack of middleware that does many things like logging, sending metrics and so... And the default 404 handler just skips all the middlewares.
I was able to solve this issue by re-setting the default 404 handler like this:
router := mux.NewRouter()
router.Use(someMiddleware())
// Re-define the default NotFound handler
router.NotFoundHandler = router.NewRoute().HandlerFunc(http.NotFound).GetHandler()
Now, the 404 default handler is also going thru all the middlewares.
答案3
得分: 2
将NotFoundHandler设置为一个处理程序方法，该方法返回您自定义的404页面。
英文:
Set the NotFoundHandler to a handler method that returns your custom 404 page.
答案4
得分: 1
你好！以下是你要翻译的内容：
r := mux.NewRouter()
h := http.HandlerFunc(NotFound)
r.NotFoundHandler = h
func NotFound(w http.ResponseWriter, r *http.Request) {
}
翻译结果：
r := mux.NewRouter()
h := http.HandlerFunc(NotFound)
r.NotFoundHandler = h
func NotFound(w http.ResponseWriter, r *http.Request) {
}
希望对你有帮助！如果还有其他问题，请随时提问。
英文:
r := mux.NewRouter()
h := http.HandlerFunc(NotFound)
r.NotFoundHandler = h
func NotFound(w http.ResponseWriter, r *http.Request) {
}
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