[游戏开发]Kratos配置允许跨域请求头中间件

中间件代码：

//MiddlewareCors 设置跨域请求头
func MiddlewareCors() middleware.Middleware {
	return func(handler middleware.Handler) middleware.Handler {
		return func(ctx context.Context, req interface{}) (interface{}, error) {
			if ts, ok := transport.FromServerContext(ctx); ok {
				if ht, ok := ts.(http.Transporter); ok {
					method := ht.Request().Method
					origin := ht.RequestHeader().Get("Origin")
					if method == nethttp.MethodOptions {
						ht.RequestHeader().Set("Access-Control-Allow-Origin", origin)
						ht.RequestHeader().Set("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,PATCH,DELETE")
						ht.RequestHeader().Set("Access-Control-Allow-Credentials", "true")
						ht.RequestHeader().Set("Access-Control-Allow-Headers", "Content-Type,"+
							"X-Requested-With,Access-Control-Allow-Credentials,User-Agent,Content-Length,Authorization")
					}
				}
			}
			return handler(ctx, req)
		}
	}
}

注册中间件

func NewHTTPServer(...) *http.Server {
	var opts = []http.ServerOption{
		http.Middleware(
			...,
			//注册中间件
			selector.Server(MiddlewareCors()).Build(),
			...,
		),
	}
	opts = append(opts, http.Network("0.0.0.0"))
	opts = append(opts, http.Address("8080"))
	opts = append(opts, http.Timeout(...)

	srv := http.NewServer(opts...)
	xxx.RegisterxxxHTTPServer(srv, xxx)
	return srv
}