我正在开发 Flutter 平板电脑应用程序。一旦输入一个输入字段,我就会尝试向服务器发送一个发布请求。以下是我为此调用的方法:
Future < http.Response > _postRequest() async {
print(globals.novaCoord.toString() + ' XYZXYZXYZXYZXYZ');
var url = globals.URL + 'api/nova_position';
Map data = {
'id_nova': '1',
'position.x': '1',
'position.y': '1',
'position.z': '1',
'position.pitch': '1',
'position.yaw': '1',
'position.roll': '1',
};
//encode Map to JSON
var body = json.encode(data);
http.Response response = await http.post(url,
headers: {
"Content-Type": "application/json"
},
body: body
);
print("${response.statusCode}");
print("${response.body}");
return response;
}
在 NodeJs 服务器端我有这个:
app.post('/api/nova_position/', async (req,res) => {
console.log("NOVA POSITION");
console.log(req.body.id_nova);
const id_nova = req.body.id_nova;
const x = req.body.position.x;
const y = req.body.position.y;
const z = req.body.position.z;
const pitch = req.body.position.pitch;
const yaw = req.body.position.yaw;
const roll = req.body.position.roll;
const position = await db.db.create_position(id_nova,x,y,z,pitch,yaw,roll);
});
但是,在服务器端,我发送的请求收到一个空的“正文”,并且收到以下错误:
(node:23939) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'x' of undefined
我现在需要帮助。我感谢任何帮助和指导。