英文:
Can Go easily emulate the behaviour of Laravel's return Redirect::back()?
问题
在使用Laravel时，我非常喜欢能够使用以下代码来返回上一个URL：
return Redirect::back();
这样可以在POST请求后返回到之前的URL。
在Go中是否有一种简单的内置方法来实现这个功能呢？
http.Redirect(w, r, backURL, http.StatusSeeOther)
其中backURL是发起POST请求的URL。
我已经查看了net/http并在Stack Exchange和Google上进行了搜索，但没有找到相关信息。如果没有简单的方法，我希望能够得到在Go中实现这个功能的惯用方式的指导。
英文:
While using Laravel, I really appreciated being able to use:
return Redirect::back();
to return to the previous URL after a POST request.
Is there a simple in-built way to do this in Go?
http.Redirect(w, r, backURL, http.StatusSeeOther)
where backURL is the URL that the POST request was made from.
I've looked through net/http and searched SE and google, but I haven't turned anything up. Failing an easy way, I'd appreciate any pointer toward the idiomatic way of doing this in Go.
答案1
得分: 4
Redirect::back()函数使用客户端（浏览器）指定的Referer HTTP头中的URL。
你可以像这样访问这个头的值：r.Header.Get("Referer")，但http.Request类型还提供了一个直接的Request.Referer()方法，返回这个Referer字段的值，同时处理了它的两种可能形式（"Referer"和"Referrer"）。
以下是模拟“返回上一页”的方法：
func PostHandler(w http.ResponseWriter, r *http.Request) {
// 处理表单，然后：
if rf := r.Referer(); rf != "" {
http.Redirect(w, r, rf, http.StatusSeeOther)
return
}
// 没有指定Referer，提供自己的响应
// 或者重定向到默认/主页
http.Redirect(w, r, "/", http.StatusSeeOther)
}
如果你想从多个处理程序中调用这个功能，可以将其封装在一个辅助函数中：
func redirectBack(w http.ResponseWriter, r *http.Request) {
if rf := r.Referer(); rf != "" {
http.Redirect(w, r, rf, http.StatusSeeOther)
return
}
// 没有指定Referer，提供自己的响应
// 或者重定向到默认/主页
http.Redirect(w, r, "/", http.StatusSeeOther)
}
然后在使用时调用它：
func PostHandler(w http.ResponseWriter, r *http.Request) {
// 处理表单，然后：
redirectBack(w, r)
}
}
[1]: https://golang.org/pkg/net/http/#Request
[2]: https://golang.org/pkg/net/http/#Request.Referer
英文:
The Redirect::back() function uses the URL from the Referer HTTP header specified by the client (browser).
You could access this header value like r.Header.Get("Referer"), but the http.Request type also provides a direct Request.Referer() method that returns the value of this Referer field, which also deals with its 2 possible forms ("Referer" and "Referrer").
This is how you can mimic the "go back" behavior:
func PostHandler(w http.ResponseWriter, r *http.Request) {
// Process form, then:
if rf := r.Referer(); rf != "" {
http.Redirect(w, r, rf, http.StatusSeeOther)
return
}
// No Referer specified, supply your own response
// or redirect to a default / home page
http.Redirect(w, r, "/", http.StatusSeeOther)
}
If you want to call this from many handlers, you may capture this functionality in a helper function:
func redirectBack(w http.ResponseWriter, r *http.Request) {
if rf := r.Referer(); rf != "" {
http.Redirect(w, r, rf, http.StatusSeeOther)
return
}
// No Referer specified, supply your own response
// or redirect to a default / home page
http.Redirect(w, r, "/", http.StatusSeeOther)
}
And then using it:
func PostHandler(w http.ResponseWriter, r *http.Request) {
// Process form, then:
redirectBack(w, r)
}
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