小编Fay*_*yaz的帖子

Map<String,String> headers = {'Content-Type':'application/json','authorization':'Basic c3R1ZHlkb3RlOnN0dWR5ZG90ZTEyMw=='};

var response = await post(Urls.getToken,
        headers: headers,
        body: {"grant_type":"password","username":"******","password":"*****","scope":"offline_access"},
      );

当我执行此操作时，我无法接收数据并且抛出的错误是

错误状态：无法设置内容类型为“application/json”的请求的正文字段

我正在尝试使用 mlab 将我的 nodejs 应用程序连接到 mongoDB，但出现错误，这对我来说是无法理解的。

let mongoose=require('mongoose');

const server='ds366482.mlab.com:11275';
const database='customer_db'
const user='xyz'
const password='xyz@5295'


mongoose.connect(`mongodb://${user}:${password}@${server}/${database}`, {useNewUrlParser: true})


let customerSchema=new mongoose.Schema({
    name:String,
    email:{
        type:String,
        required:true,
        unique:true
    }
})

这是我的代码的实际结果：

server has started on 3000
(node:4800) UnhandledPromiseRejectionWarning: MongoParseError: Unescaped at-sign in authority section
    at parseConnectionString (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongodb-core/lib/uri_parser.js:450:21)
    at connect (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongodb/lib/operations/mongo_client_ops.js:180:3)
    at connectOp (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongodb/lib/operations/mongo_client_ops.js:284:3)
    at executeOperation (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongodb/lib/utils.js:420:24)
    at MongoClient.connect (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongodb/lib/mongo_client.js:168:10)
    at Promise (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongoose/lib/connection.js:521:12)
    at new Promise (<anonymous>)
    at NativeConnection.Connection.openUri (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongoose/lib/connection.js:518:19)
    at Mongoose.connect (/home/admybrand/Desktop/Gaurav's Stuff/rest-api/node_modules/mongoose/lib/index.js:270:15)
    at …

我的应用程序中有一个屏幕，其中有一些其他小部件和 CircularProgressIndicator，我需要帮助在任务完成时显示和隐藏进度条，而无需更改整个屏幕的状态