英文:
Why the r.Method != "POST" branch does not reach?
问题
下面是snippetCreate函数中的if分支，当我发送除POST以外的请求时，它不会执行：
func snippetCreate(w http.ResponseWriter, r *http.Request) {
// 在这个if语句下的任何代码都不会执行，我甚至尝试写日志和fmt打印
// 使用除POST以外的不同请求进行测试
if r.Method != "POST" {
w.Header().Set("Allow", "POST")
http.Error(w, "Method Not Allowed", 405)
return
}
// 这里的代码会执行
w.Header().Set("Allow", "POST")
w.Write([]byte("create a snippet"))
}
func main() {
r := chi.NewRouter()
r.Use(middleware.Logger)
r.Get("/", home)
r.Get("/snippet/view", snippetView)
r.Post("/snippet/create", snippetCreate)
log.Print("Starting server on port :8080")
err := http.ListenAndServe(":8080", r)
if err != nil {
log.Fatal(err)
}
}
英文:
The if branch in the snippetCreate func below doesn't reach when I make requests other than POST:
func snippetCreate(w http.ResponseWriter, r *http.Request) {
// anything under this if statement doesnt work, I tried even write logs and fmt prints
// tested with different requests other than POST
if r.Method != "POST" {
w.Header().Set("Allow", "POST")
http.Error(w, "Method Not Allowed", 405)
return
}
// it works
w.Header().Set("Allow", "POST")
w.Write([]byte("create a snippet"))
}
func main() {
r := chi.NewRouter()
r.Use(middleware.Logger)
r.Get("/", home)
r.Get("/snippet/view", snippetView)
r.Post("/snippet/create", snippetCreate)
log.Print("Starting server on port :8080")
err := http.ListenAndServe(":8080", r)
if err != nil {
log.Fatal(err)
}
}
答案1
得分: 1
> r.Post("/snippet/create", snippetCreate)
注意这里的 Post。只有 POST 请求会被路由到 snippetCreate 处理程序。
所以在处理程序 snippetCreate 中，r.Method 的值将始终为 POST。请参阅 (*Mux).Post 的文档：
> Post 添加了一个匹配 POST HTTP 方法的 pattern 路由，以执行 handlerFn。
英文:
> r.Post("/snippet/create", snippetCreate)
Note the Post here. Only POST requests will be routed to the handler snippetCreate.
So in the handler snippetCreate, r.Method will always be POST. See the doc for (*Mux).Post:
> Post adds the route pattern that matches a POST http method to execute the handlerFn.
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