如何使用带有反向代理的响应标头设置cookie？

您可以定义一个自定义类型，该类型将包装ResponseWriter并在写入所有标头之前插入Server标头，但要付出额外的间接层费用。这是一个例子：

type serverWriter struct {    whttp.ResponseWriter    name        string    wroteHeader bool}func (s serverWriter) WriteHeader(pre int) {    if s.wroteHeader == false {        s.w.Header().Set("Server", s.name)        s.wroteHeader = true    }    s.w.WriteHeader(pre)}func (s serverWriter) Write(b []byte) (int, error) {    return s.w.Write(b)}func (s serverWriter) Header() http.Header {    return s.w.Header()}// Server attaches a Server header to the response.func Server(h http.Handler, serverName string) http.Handler {    return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {        sw := serverWriter{ w:w, name:        serverName, wroteHeader: false,        }        h.ServeHTTP(sw, r)    })}

我在这里写了更多有关此的内容。https://kev.inburke.com/kevin/how-to-write-go-middleware/