英文:
Why does this get served on every URL request?
问题
package main
import "fmt"
import "net/http"
func home(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "What!")
}
func bar(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Bar!")
}
func main() {
http.HandleFunc("/", home)
http.HandleFunc("/foo", bar)
http.ListenAndServe(":5678", nil)
}
如果我访问 `/foo`，将会运行 `bar` 函数。
如果我访问 `/` 或者 `/any/other/path`，将会运行 `home` 函数。
你有什么想法为什么会这样？如何处理 404 错误？
英文:
package main
import "fmt"
import "net/http"
func home(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "What!")
}
func bar(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Bar!")
}
func main() {
http.HandleFunc("/", home)
http.HandleFunc("/foo", bar)
http.ListenAndServe(":5678", nil)
}
If I visit /foo, bar will run.
If I visit / or /any/other/path, home will run.
Any idea why this happens? How can I handle 404's?
答案1
得分: 3
这是一种设计行为 - 以“/”结尾的路径的处理程序也将处理任何子路径。
请注意，由于以斜杠结尾的模式表示根子树，模式“/”匹配所有未被其他注册模式匹配的路径，而不仅仅是路径为“/”的URL。
你需要为404错误实现自己的逻辑。考虑以下来自golang文档的示例：
mux := http.NewServeMux()
mux.Handle("/api/", apiHandler{})
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
// “/”模式匹配所有内容，因此我们需要在这里检查是否在根路径。
if req.URL.Path != "/" {
http.NotFound(w, req)
return
}
fmt.Fprintf(w, "欢迎访问首页！")
})
http://golang.org/pkg/net/http/#ServeMux.Handle
英文:
This is a behaviour by design - handler defined for path ending with / will also handle any subpath.
> Note that since a pattern ending in a slash names a rooted subtree, the pattern "/" matches all paths not matched by other registered patterns, not just the URL with Path == "/".
http://golang.org/pkg/net/http/#ServeMux
You have to implement you own logic for 404. Consider the following example from the golang doc:
mux := http.NewServeMux()
mux.Handle("/api/", apiHandler{})
mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
// The "/" pattern matches everything, so we need to check
// that we're at the root here.
if req.URL.Path != "/" {
http.NotFound(w, req)
return
}
fmt.Fprintf(w, "Welcome to the home page!")
})
答案2
得分: 2
你需要在 home 中处理自己的 404 错误。
英文:
You have to handle your own 404s in home.
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