```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)
```
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