英文:
Get 301 status code when sending GET request with parameter
问题
我有一个非常简单的Go服务器代码设置，使用mux，当我使用curl进行GET请求参数（localhost:8080/suggestions/?locale=en）时，我得到301状态码（永久移动）。但是当没有GET参数时，它正常工作。
func main() {
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/suggestions", handleSuggestions).Methods("GET")
log.Fatal(http.ListenAndServe("localhost:8080", router))
}
有人可以给我解释一下吗？谢谢。
英文:
I have a very simple Go server code setup with mux and when I use curl with GET request params (localhost:8080/suggestions/?locale=en), I get 301 status code (Move permanently). But when there's no get parameters, it's working just fine.
func main() {
router := mux.NewRouter().StrictSlash(true)
router.HandleFunc("/suggestions", handleSuggestions).Methods("GET")
log.Fatal(http.ListenAndServe("localhost:8080", router))
}
Can somebody shed me a light on this.Thanks
答案1
得分: 4
go doc mux.StrictSlash 说明：
func (r *Router) StrictSlash(value bool) *Router
StrictSlash 方法用于定义新路由的尾部斜杠行为。初始值为 false。
当设置为 true 时，如果路由路径为 "/path/"，访问 "/path" 将会重定向到前者，反之亦然。换句话说，你的应用程序将始终按照路由中指定的路径进行处理。
当设置为 false 时，如果路由路径为 "/path"，访问 "/path/" 将不会匹配该路由，反之亦然。
特殊情况：当路由使用 PathPrefix() 方法设置路径前缀时，严格斜杠设置将被忽略，因为仅凭前缀无法确定重定向行为。然而，从该路由创建的任何子路由器都会继承原始的 StrictSlash 设置。
因此，为了避免重定向，你可以使用 mux.NewRouter().StrictSlash(false)，它等同于 mux.NewRouter()，或者使用带有尾部斜杠的 URL，例如 router.HandleFunc("/suggestions/", handleSuggestions).Methods("GET")。
英文:
go doc mux.StrictSlash states:
func (r *Router) StrictSlash(value bool) *Router
StrictSlash defines the trailing slash behavior for new routes. The initial
value is false.
When true, if the route path is "/path/", accessing "/path" will redirect to
the former and vice versa. In other words, your application will always see
the path as specified in the route.
When false, if the route path is "/path", accessing "/path/" will not match
this route and vice versa.
Special case: when a route sets a path prefix using the PathPrefix() method,
strict slash is ignored for that route because the redirect behavior can't
be determined from a prefix alone. However, any subrouters created from that
route inherit the original StrictSlash setting.
So to avoid the redirects you can either mux.NewRouter().StrictSlash(false) which is equivalent to mux.NewRouter() or use a URL with a trailing slash i.e. router.HandleFunc("/suggestions/", handleSuggestions).Methods("GET")
答案2
得分: 3
这是因为你注册了路径/suggestions（注意：没有尾部斜杠），然后你调用了URLlocalhost:8080/suggestions/?locale=en（/suggestions后面有一个尾部斜杠）。
你的路由器检测到有一个已注册的路径与请求的路径匹配，但没有尾部斜杠（基于你的Router.StrictSlash()策略），所以它发送了一个重定向，当跟随重定向时，会导向一个有效的已注册路径。
只需在suggestions后面使用没有尾部斜杠的URL：
localhost:8080/suggestions?locale=en
英文:
That's simply because you registered the path /suggestions (note: there is no trailing slash), and you call the URL localhost:8080/suggestions/?locale=en (there is a trailing slash after /suggestions).
You router detects that there's a registered path which would match the requested path without the trailing slash (based on your Router.StrictSlash() policy), so it sends a redirect which when followed would lead you to a valid, registered path.
Simply use a URL without trailing slash after suggestions:
localhost:8080/suggestions?locale=en
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