通过头错误代码返回或JSON响应终止http请求

Question

如何从HandleFunc调用多个错误返回函数？

我在这个链接中找到了类似于我需要的东西：Golang：终止或中止HTTP请求。

http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
   // examine incoming params
   if !ok {
   http.Error(w, `Invalid input params!`, http.StatusBadRequest) 
   return
          }

   // Do normal API serving
})

http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    // examine incoming params
    if !ok {
        w.Header().Set("Content-Type", "application/json")
        w.WriteHeader(http.StatusBadRequest)
        str := `{"Result":"","Error":"No valide Var"}`
        fmt.Fprint(w, str)
        return
    }

    // Do normal API serving
})

 if isJsonError {
    //call HTTP function to serve JSON error
   }
 if isHTTPError {
   //call HTTP function to serve an HTTP error
}

附注：我还读过以下博客帖子：http://blog.golang.org/error-handling-and-go

那里有一个部分叫做“简化重复性错误处理”--这很酷，但我需要简化多个重复性错误处理，我不知道怎么做。

Answer 1

类似于这样：

func badReq(w http.ResponseWriter, isJson bool, err string) {
    if !isJson {
        http.Error(w, err, http.StatusBadRequest)
        return
    }
    w.Header().Set("Content-Type", "application/json")
    w.WriteHeader(http.StatusBadRequest)
    fmt.Fprintf(w, `{"result":"","error":%q}`, err)
}



http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    if !ok {
        badReq(w, true, "no valid var")
        return
    }
})