go - 如何在 http.ResponseWriter 上设置 HTTP 状态码

Question

如何在 http.ResponseWriter 上设置 HTTP 状态码(例如设置为 500 或 403)？

我可以看到请求通常附加一个状态码 200。

Answer 1

使用 http.ResponseWriter.WriteHeader .来自文档:

WriteHeader sends an HTTP response header with status code. If WriteHeader is not called explicitly, the first call to Write will trigger an implicit WriteHeader(http.StatusOK). Thus explicit calls to WriteHeader are mainly used to send error codes.

例子:

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