英文:
Redirect requests for static files
问题
我正在尝试提供一个静态的HTML文件，这个文件中包含指向其他资源的脚本标签。我想将HTML文件从一个目录中提供，但是将对资源的请求重定向到另一个目录。这是我目前的设置：
// server.go
import (
"fmt"
"html/template"
"log"
"net/http"
"path"
"time"
)
func handle(w http.ResponseWriter, r *http.Request) {
lp := path.Join("./", "index.html")
fmt.Println(lp)
tmpl, err := template.ParseFiles(lp)
if err != nil {
log.Fatal(err)
}
tmpl.ExecuteTemplate(w, "index", nil)
}
func main() {
fs := http.FileServer(http.Dir("../../app_assets/"))
http.Handle("/assets", fs)
http.HandleFunc("/static/", handle)
fmt.Println("Go Server listening on port 8000")
http.ListenAndServe(":8000", nil)
}
这是我的模板：
<!-- index.html -->
{{define "index"}}
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<link rel="stylesheet" href="assets/css/libs.css" type="text/css" />
</head>
<body>
<script type="text/javascript" src="assets/js/libs.js"></script>
<h1> Hello </h1>
</body>
</html>
{{end}}
我能够从localhost:8000/static/提供index文件，但是资源请求没有指向两级上的assets文件夹(../../)。我做错了什么？
注意：
当加载libs.js时，我在控制台中得到以下错误：
Uncaught SyntaxError: Unexpected token <
这让我相信对libs.js文件的请求被重定向到了HTML标记。
这是怎么发生的？
注意2：
当我浏览对libs.js的请求结果时，我看到的是HTML标记。即使使用了下面建议的StripPrefix方法。我做错了什么？
英文:
I'm trying to serve a static html file, and this file has script tags that point to other resources. I want to serve the html file from one directory but then redirect requests for assets to another directory. This is how I'm setting it up now:
// server.go
import (
"fmt"
"html/template"
"log"
"net/http"
"path"
"time"
)
func handle(w http.ResponseWriter, r *http.Request) {
lp := path.Join("./", "index.html")
fmt.Println(lp)
tmpl, err := template.ParseFiles(lp)
if err != nil {
log.Fatal(err)
}
tmpl.ExecuteTemplate(w, "index", nil)
}
func main() {
fs := http.FileServer(http.Dir("../../app_assets/"))
http.Handle("/assets", fs)
http.HandleFunc("/static/", handle)
fmt.Println("Go Server listening on port 8000")
http.ListenAndServe(":8000", nil)
}
Here is my template:
<!-- index.html -->
{{define "index"}}
<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<link rel="stylesheet" href="assets/css/libs.css" type="text/css" />
</head>
<body>
<script type="text/javascript" src="assets/js/libs.js"></script>
<h1> Hello </h1>
</body>
</html>
{{end}}
I'm able to serve the index file from localhost:8000/static/, but asset requests are not going to the assets folder two levels up (../../). What am I doing wrong?
NOTE:
I'm getting this error in the console when libs.js is loaded:
Uncaught SyntaxError: Unexpected token <
This leads me to believe that the request for the libs.js file is being redirected to the html markup.
How is this happening?
NOTE 2:
When I browse the result of the request for libs.js, I see the html markup. Even after using StripPrefix as advised below. What am I doing wrong?
答案1
得分: 0
所以我知道这有点令人困惑，但你想将fs := http.FileServer(http.Dir("../../assets/"))更改为fs := http.FileServer(http.Dir("../.."))。
原因是路径“assets”已经在请求中指定，所以按照你的写法，实际上指向的是../../assets/assets/*。
希望这能帮到你！
哦，为了防止另一个错误，Handle()函数的路径应该以斜杠结尾。我差点忘记提醒你这一点。
编辑
为了适应你的其他需求（使用某种重定向），你需要使用http.StripPrefix处理程序。https://golang.org/pkg/net/http/#StripPrefix
对于你的用例，你可以使用以下代码准备服务器：
fs := http.FileServer(http.Dir("../../app_assets"))
http.Handle("/assets/", http.StripPrefix("/assets/", fs))
这样可以实现文件系统服务的URL重写。
英文:
So I know it's a bit confusing, but you want to change fs := http.FileServer(http.Dir("../../assets/")) to be fs := http.FileServer(http.Dir("../.."))
The reason is that the path for "assets" is already specified in the request so as you have it, it is really pointing to ../../assets/assets/*
Hope that helps!
oh and just to prevent another error, that Handle() functions should be written with a trailing slash in the path. I almost forgot to catch that.
EDIT
To adjust my answer for your other need (using some sort of redirect) you'd have to use the http.StripPrefix handler https://golang.org/pkg/net/http/#StripPrefix
For your use case you would prepare your server with the following code:
fs := http.FileServer(http.Dir("../../app_assets"))
http.Handle("/assets/", http.StripPrefix("/assets/", fs))
This lets you do url rewrites for file system serving.
答案2
得分: 0
在你的HTML中，当你指定CSS和JS的src属性时，你使用了src="assets/js/libs.js"。这使得这些文件相对于当前路径进行请求。所以请求会发送到http://localhost:8000/static/assets/js/libs.js。
由于这里有/static前缀，它将由你的/static处理程序处理，因此HTML文件被提供。
要使其发送到/assets处理程序，需要在src前加上/。
<script type="text/javascript" src="/assets/js/libs.js"></script>
现在服务器将在../../app_assets/assets/js/libs.js位置查找该文件。
如果你希望它是../../app_assets/js/libs.js，你可以在服务器端使用StripPrefix来从URL中去除assets部分。
fs := http.StripPrefix("/assets/", http.FileServer(http.Dir("../../app_assets/")))
http.Handle("/assets/", fs)
英文:
In your html when you specify the src attributes of your css and js you have src="assets/js/libs.js". This makes those files to be requested relative to the current path. So the request goes to http://localhost:8000/static/assets/js/libs.js.
Since this has the /static prefix it will be handled by your /static handler and hence the html file is served.
To make it go to /assets handler, specify the src with a / prefixed.
<script type="text/javascript" src="/assets/js/libs.js"></script>
Now the server will look for the file at ../../app_assets/assets/js/libs.js.
If you want it to be ../../app_assets/js/libs.js, you can use StripPrefix to take out the assets part from the url in the server.
fs := http.StripPrefix("/assets/", http.FileServer(http.Dir("../../app_assets/")))
http.Handle("/assets/", fs)
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