Downloaded introspectionSchema.json File is not completed

for instance, I will use
https://apollo-fullstack-tutorial.herokuapp.com/graphql

when I manually download the schema from the playground (I mean the right side Schema button and then pressed on download btn ) to use it for an android client the introspectionSchema.json that I got has many errors

when I use the JSON file to generate models always got this error
****Failed to locate schema root node `__schema`**
also if I put the whole JSON object inside these
`
{
"data": {
"__schema": { here }
}
}`

then i got this error
****Required value 'types_' (JSON name 'types') missing at $.data.__schema**

so i realised that the downloaded json file is uncompleted for some reason

打开 https://apollo-fullstack-tutorial.herokuapp.com/graphql 中的 Apollo Playground，并使用 introspectionSchema.json 重现 Schema 下载。将下载的文档与报告的错误进行比较，并验证结果包含 data.__schema.types，以便无需手动添加 wrapper 即可用于 Android 模型生成。

由索引模型根据 Issue 内容生成。