我可以使用以下提要在讨论中创建新帖子
Feed: host/d2l/api/le/(D2LVERSION: version)/(D2LID: orgUnitId)/discussions/forums/(D2LID: forumId)/topics/(D2LID: topicId)/posts/
Content-Type:"application/json"
http-Metohd:POST
http-body:{
"ParentPostId": null,
"Subject": "IOS Testing",
"Message": {"Content": "ios Test meassage","Type": "Text"},
"IsAnonymous": "false"
}
我怎样才能附上这个文件?