如何在http.ResponseWriter上设置HTTP状态代码

Question

如何在http.ResponseWriter(例如500或403)上设置HTTP状态代码？

我可以看到请求通常附加了200的状态代码.

Answer 1

使用http.ResponseWriter.WriteHeader.从文档:

WriteHeader发送带有状态代码的HTTP响应头.如果未显式调用WriteHeader,则第一次调用Write将触发隐式WriteHeader(http.StatusOK).因此,对WriteHeader的显式调用主要用于发送错误代码.

例:

func ServeHTTP(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusInternalServerError)
    w.Write([]byte("500 - Something bad happened!"))
}

Answer 2

除了WriteHeader(int)你可以使用辅助方法http.Error,例如:

func yourFuncHandler(w http.ResponseWriter, r *http.Request) {

    http.Error(w, "my own error message", http.StatusForbidden)

    // or using the default message error

    http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
}

http.Error()和http.StatusText()方法是你的朋友

Answer 3

w.WriteHeader(http.StatusInternalServerError)
w.WriteHeader(http.StatusForbidden)

完整列表在这里