valueCtx的value键值对存放结构体，无法读取结构体字段

```golang import ( "context" "fmt" "reflect" ) type MyRequest struct { Url string Method string Params map[string]interface{} } func main() { params := make(map[string]interface{}) rootRequest := MyRequest{ Url: "https://localhost:8080/getinfo", Method: "Post", Params: params, } httpCtx := context.WithValue(context.Background(), "request", rootRequest) value1 := httpCtx.Value("request") fmt.Println(reflect.TypeOf(value1)) fmt.Println(value1.Url) } ``` 如上代码，```fmt.Println(reflect.TypeOf(value1))```打印结果为```main.MyRequest```，但是```fmt.Println(value1.Url)```却会报错： ```shell value1.Url undefined (type interface {} is interface with no methods) ```