如何限制用golang编写的web服务器允许一个特定的地址而不是一个模式？ [英] How to restrict web server written in golang to allow a particular address instead of a pattern?

问题描述

当我使用

  http.HandleFunc（/，serveRest）// serveRest是处理请求的方法
 http.ListenAndServe（localhost：4000，nil）
  

它会接受所有请求开始与/。我如何限制它只为>localhost：4000，而不是像localhost：4000 / *？

你们可以为我推荐一个好的Go教程吗？

解决方案

注册处理程序的URL模式记录在 http.ServeMux 类型：
$ b

模式名称固定的根路径，如/ favicon.ico，或根源子树，如/ images /（注意尾部斜线）。较长的模式优先于较短的模式，因此如果有处理程序注册了/ images /和/ images / thumbnails /，后一个处理程序将调用路径以/ images / thumbnails /开头，前者将收到/ images /子树中任何其他路径的请求。

请注意，由于以斜线结尾的模式命名了根子树，匹配所有未被其他注册模式匹配的路径，而不仅仅是具有Path ==/\".

所以不幸的是没有它只匹配根（/）。

但是你可以在你的处理程序中轻松地检查它，如果请求路径不是根目录，你可以做任何你想做的事：

  func serveRest（w http.ResponseWriter，r * http .Request）{
 if r.URL.Path！=/{
 w.Write（[] byte（Not root！））
 return 
} 
 
 w.Write（[] byte（这是root！））
} 
  

如果您想返回 HTTP 404找不到 b
$ b

  func serveRest（w http.ResponseWriter，r * http.Request）{
 if r.URL.Path！=/{
 http.NotFound（w，r）
 return 
} 
 
 w.Write（[]字节（Hi！））
} 
  

Go教程： https://tour.golang.org/

另外检查在 上转到 标签信息，它包含 Go Tutorials 。

When I use

http.HandleFunc("/", serveRest)  //serveRest is the method to handle request
http.ListenAndServe("localhost:4000", nil)

It will accept all request starting with "/". How do I restrict it to serve only "localhost:4000" instead of every address like "localhost:4000/*"?

And can you guys suggest me a good tutorial for Go?

解决方案

The URL pattern to which you register your handlers is documented in the http.ServeMux type:

Patterns name fixed, rooted paths, like "/favicon.ico", or rooted subtrees, like "/images/" (note the trailing slash). Longer patterns take precedence over shorter ones, so that if there are handlers registered for both "/images/" and "/images/thumbnails/", the latter handler will be called for paths beginning "/images/thumbnails/" and the former will receive requests for any other paths in the "/images/" subtree.

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 == "/".

So unfortunately there is no pattern which matches only the root ("/").

But you can easily check this in your handler, and do whatever you want to if the request path is not the root:

func serveRest(w http.ResponseWriter, r *http.Request) {
    if r.URL.Path != "/" {
        w.Write([]byte("Not root!"))
        return
    }

    w.Write([]byte("Hi, this is the root!"))
}

If you want to return HTTP 404 Not found error for non-roots:

func serveRest(w http.ResponseWriter, r *http.Request) {
    if r.URL.Path != "/" {
        http.NotFound(w, r)
        return
    }

    w.Write([]byte("Hi!"))
}

And Go tutorial: https://tour.golang.org/

Also check out the Go tag info here on SO, it has a section Go Tutorials.

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