如何使绝对路径HTTP在golang

我正在读的源代码goto重定向，我发现下面的代码goto/talk/0/main.go：如何使绝对路径HTTP在golang

http.Redirect(w, r, url, http.StatusFound)

根据上下文，url是一个绝对路径，以及预期绝对路径重定向。但是，随着golang/http/redirect提到：

Redirect答复与重定向到URL，其可以是相对于该请求路径的路径请求。

它作为相对路径重定向的结果。我不知道http.Redirect之前是否做过绝对路径重定向，但现在不是。

那么如何在golang中做出绝对路径重定向呢？我搜索了互联网，但没有发现任何人，任何人都可以帮我吗？在此先感谢。

来源

2012-08-13 carter2000

我终于发现，执行的绝对路径重定向，将url必须是一个完整的URL，如http://www.stackoverflow.com或https://github.com，但不www.stackoverflow.com。

来源

2012-08-13 12:34:19 carter2000

你能添加一个链接到doc吗？ – 2012-08-13 15:36:12

@orian [链接] http://golang.org/pkg/net/http/#Redirect [链接]，这里是http.Redirect的文档，但它提到前缀“http：//”将执行绝对路径重定向。 – carter2000 2012-08-14 01:05:33

当你去golang文档http.Redirect，实际上你可以点击蓝色标题：

FUNC Redirect

它会带给你的源代码上市这是不言自明：

// Redirect replies to the request with a redirect to url, 
// which may be a path relative to the request path. 
func Redirect(w ResponseWriter, r *Request, urlStr string, code int) { 
    if u, err := url.Parse(urlStr); err == nil { 
     // If url was relative, make absolute by 
     // combining with request path. 
     // The browser would probably do this for us, 
     // but doing it ourselves is more reliable. 

     // NOTE(rsc): RFC 2616 says that the Location 
     // line must be an absolute URI, like 
     // "http://www.google.com/redirect/", 
     // not a path like "/redirect/". 
     // Unfortunately, we don't know what to 
     // put in the host name section to get the 
     // client to connect to us again, so we can't 
     // know the right absolute URI to send back. 
     // Because of this problem, no one pays attention 
     // to the RFC; they all send back just a new path. 
     // So do we. 
     oldpath := r.URL.Path 
     if oldpath == "" { // should not happen, but avoid a crash if it does 
      oldpath = "/" 
     } 
     if u.Scheme == "" { 
      // no leading http://server 
      if urlStr == "" || urlStr[0] != '/' { 
       // make relative path absolute 
       olddir, _ := path.Split(oldpath) 
       urlStr = olddir + urlStr 
      } 

      var query string 
      if i := strings.Index(urlStr, "?"); i != -1 { 
       urlStr, query = urlStr[:i], urlStr[i:] 
      } 

      // clean up but preserve trailing slash 
      trailing := strings.HasSuffix(urlStr, "/") 
      urlStr = path.Clean(urlStr) 
      if trailing && !strings.HasSuffix(urlStr, "/") { 
       urlStr += "/" 
      } 
      urlStr += query 
     } 
    } 

    w.Header().Set("Location", urlStr) 
    w.WriteHeader(code) 

    // RFC2616 recommends that a short note "SHOULD" be included in the 
    // response because older user agents may not understand 301/307. 
    // Shouldn't send the response for POST or HEAD; that leaves GET. 
    if r.Method == "GET" { 
     note := "<a href=\"" + htmlEscape(urlStr) + "\">" + statusText[code] + 
       "</a>.\n" 
     fmt.Fprintln(w, note) 
    } 
}

这个技巧也适用于其他功能。

来源

2013-09-26 14:02:12

如何使绝对路径HTTP在golang

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