如何解决flutter中的http错误代码400缺少参数？
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【中文标题】如何解决flutter中的http错误代码400缺少参数？【英文标题】：How to solve http error code 400 missing parameters in flutter? 【发布时间】：2019-06-25 05:29:34 【问题描述】：我有一个注册页面，我通过传递参数电子邮件、用户名、密码、名字和姓氏向服务器发出 http.post 请求。我已经尝试了一切，但无法解决问题。每当我点击注册按钮时，它都会显示以下内容 - “我/扑（2914）：400 我/颤振（2914）：“代码”：“rest_missing_callback_param”，“消息”：“缺少参数：电子邮件，用户名，密码”，“数据”：“状态”：400，“参数”：[ "电子邮件","用户名","密码"]"
我已经浏览了其他帖子，但他们没有解决我的问题，所以请帮忙。 提前致谢。
import 'dart:convert';
import 'dart:io';
import 'package:flutter/material.dart';
import 'package:http/http.dart' as http;
import 'package:restaurant_app/globalVar.dart';
import 'package:restaurant_app/homescreen.dart';
class SignUp extends StatefulWidget
@override
_SignUpState createState() => _SignUpState();
class _SignUpState extends State<SignUp> with SingleTickerProviderStateMixin
TabController controller;
TextEditingController _firstnameController;
TextEditingController _lastnameController;
TextEditingController _usernameController;
TextEditingController _emailController;
TextEditingController _passwordController;
TextEditingController _rePasswordController;
bool loading;
final GlobalKey<ScaffoldState> _scaffoldKey = new GlobalKey<ScaffoldState>
();
@override
void initState()
// TODO: implement initState
super.initState();
controller = new TabController(length: 2, vsync: this);
loading = false;
_firstnameController = new TextEditingController(text: "Vishal");
_lastnameController = new TextEditingController(text: "Das");
_usernameController = new TextEditingController(text: "vishaldas");
_emailController = new TextEditingController(text: "vissudas@gmail.com");
_passwordController = new TextEditingController(text: "Vishal@123");
_rePasswordController = new TextEditingController(text: "Vishal@123");
@override
void dispose()
// TODO: implement dispose
super.dispose();
controller.dispose();
setState(()
loading = false;
);
_emailController.dispose();
_usernameController.dispose();
_passwordController.dispose();
_firstnameController.dispose();
_lastnameController.dispose();
_rePasswordController.dispose();
// static final String fullnameKey = 'fullname';
// static final String emailKey = 'email';
// static final String passwordkey = 'password';
signUp(email, username, password, firstname, lastname) async
setState(()
loading = true;
);
var body = json.encode(
"email": email,
"username": username,
"password": password,
"firstname": firstname,
"lastname": lastname,
);
String basicAuth =
'Basic' + base64Encode(utf8.encode('$username:$password'));
Map<String, String> headers =
HttpHeaders.AUTHORIZATION: basicAuth,
;
print(basicAuth);
await http
.post("$GlobalVar.urlwp-json/wc/v2/customers",
body: body, headers: headers)
.then((response)
var body = json.decode(response.body);
print(response.statusCode);
print(response.body);
if (response.statusCode == 200)
loading = false;
Navigator.pushReplacement(context,
MaterialPageRoute(builder: (BuildContext ctx) => HomePage()));
else
final snackBar = SnackBar(content: Text(body['message']));
_scaffoldKey.currentState.showSnackBar(snackBar);
setState(()
loading = false;
);
);
@override
Widget build(BuildContext context)
return Scaffold(
resizeToAvoidBottomPadding: false,
key: _scaffoldKey,
body: Container(
decoration: BoxDecoration(
image: DecorationImage(
image: AssetImage('images/art.png'),
fit: BoxFit.fill,
colorFilter: ColorFilter.mode(
Colors.white12.withOpacity(0.2), BlendMode.dstATop),
),
),
child: ListView(
shrinkWrap: true,
physics: BouncingScrollPhysics(),
children: <Widget>[
SizedBox(
height: MediaQuery.of(context).size.height / 35,
),
Align(
alignment: Alignment.topCenter,
child: CircleAvatar(
backgroundColor: Colors.grey,
radius: 55.0,
backgroundImage: AssetImage('images/logo.png'),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 40,
),
Stack(
alignment: Alignment.center,
children: <Widget>[
SizedBox(
height: 2.0,
child: new Center(
child: new Container(
height: 10.0,
color: Colors.black12,
),
),
),
Row(
children: <Widget>[
SizedBox(
width: MediaQuery.of(context).size.width / 4,
),
Chip(
label: Text(
"SIGN IN",
style: TextStyle(color: Colors.white, fontSize: 18.0),
),
backgroundColor: Color(0xFFD1A155),
),
SizedBox(
width: MediaQuery.of(context).size.width / 35,
child: Container(
width: MediaQuery.of(context).size.height / 12,
height: 2.0,
color: Colors.white,
),
),
Chip(
label: Text(
"SIGN UP",
style: TextStyle(color: Colors.white, fontSize: 18.0),
),
backgroundColor: Colors.black87,
),
],
)
],
),
SizedBox(
height: MediaQuery.of(context).size.height / 30,
),
Align(
alignment: Alignment.center,
child: Text(
"Sign Up Maa ki Rasoi",
style: TextStyle(
fontSize: 20.0,
color: Color(0xFFD1A155),
),
)),
SizedBox(
height: MediaQuery.of(context).size.height / 30,
),
Column(
children: <Widget>[
Theme(
data: ThemeData(
hintColor: Colors.black26,
primaryColor: Color(0xFFD1A155),
),
child: Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: TextField(
controller: _firstnameController,
decoration: InputDecoration(
border: OutlineInputBorder(borderSide: BorderSide()),
prefixIcon: Icon(
Icons.person,
color: Color(0xFFD1A155),
),
hintText: 'First name',
hintStyle: TextStyle(
color: Colors.black,
fontWeight: FontWeight.w400)),
keyboardType: TextInputType.text,
),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 50,
),
Theme(
data: ThemeData(
hintColor: Colors.black26,
primaryColor: Color(0xFFD1A155),
),
child: Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: TextField(
controller: _lastnameController,
decoration: InputDecoration(
border: OutlineInputBorder(borderSide: BorderSide()),
prefixIcon: Icon(
Icons.person,
color: Color(0xFFD1A155),
),
hintText: 'Last name',
hintStyle: TextStyle(
color: Colors.black,
fontWeight: FontWeight.w400)),
keyboardType: TextInputType.text,
),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 50,
),
Theme(
data: ThemeData(
primaryColor: Color(0xFFD1A155),
hintColor: Colors.black26),
child: Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: TextField(
controller: _emailController,
decoration: InputDecoration(
border: OutlineInputBorder(borderSide: BorderSide()),
prefixIcon: Icon(
Icons.email,
color: Color(0xFFD1A155),
),
hintText: 'Email Address',
hintStyle: TextStyle(
color: Colors.black,
fontWeight: FontWeight.w400)),
keyboardType: TextInputType.emailAddress,
),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 50,
),
Theme(
data: ThemeData(
hintColor: Colors.black26,
primaryColor: Color(0xFFD1A155),
),
child: Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: TextField(
controller: _usernameController,
decoration: InputDecoration(
border: OutlineInputBorder(borderSide: BorderSide()),
prefixIcon: Icon(
Icons.supervised_user_circle,
color: Color(0xFFD1A155),
),
hintText: 'Username',
hintStyle: TextStyle(
color: Colors.black,
fontWeight: FontWeight.w400)),
keyboardType: TextInputType.text,
),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 50,
),
Theme(
data: ThemeData(
hintColor: Colors.black26,
primaryColor: Color(0xFFD1A155),
),
child: Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: TextField(
controller: _passwordController,
decoration: InputDecoration(
border: OutlineInputBorder(borderSide: BorderSide()),
prefixIcon: Icon(
Icons.lock,
color: Color(0xFFD1A155),
),
hintText: 'Password',
hintStyle: TextStyle(
color: Colors.black,
fontWeight: FontWeight.w400)),
keyboardType: TextInputType.text,
obscureText: true,
),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 50,
),
Theme(
data: ThemeData(
primaryColor: Color(0xFFD1A155),
hintColor: Colors.black26),
child: Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: TextField(
controller: _rePasswordController,
decoration: InputDecoration(
border: OutlineInputBorder(borderSide: BorderSide()),
prefixIcon: Icon(
Icons.lock,
color: Color(0xFFD1A155),
),
hintText: 'Re - Password',
hintStyle: TextStyle(
color: Colors.black,
fontWeight: FontWeight.w400)),
keyboardType: TextInputType.text,
obscureText: true,
),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 50,
),
Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: InkWell(
onTap: ()
print(_emailController.text);
print(_passwordController.text);
print(_usernameController.text);
signUp(
_emailController.text,
_usernameController.text,
_passwordController.text,
_firstnameController.text,
_lastnameController.text,
);
,
child: loading
? CircularProgressIndicator()
: Container(
height: MediaQuery.of(context).size.height / 13,
//width: MediaQuery.of(context).size.height / 1.8,
decoration: BoxDecoration(
color: Color(0xFFD1A155),
borderRadius: BorderRadius.circular(5.0),
),
child: Center(
child: Text(
"SIGN UP",
style: TextStyle(
color: Colors.white, fontSize: 18.0),
),
),
),
),
)
],
),
SizedBox(
height: MediaQuery.of(context).size.height / 30,
),
Stack(
alignment: Alignment.center,
children: <Widget>[
SizedBox(
height: 2.0,
child: new Center(
child: new Container(
height: 10.0,
color: Colors.black12,
),
),
),
Container(
height: MediaQuery.of(context).size.height / 18,
width: MediaQuery.of(context).size.height / 11,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(23.0),
color: Colors.white,
border: Border.all(color: Colors.black12)),
child: Center(
child: Text(
"OR",
style: TextStyle(fontSize: 18.0),
)),
),
],
),
SizedBox(
height: MediaQuery.of(context).size.height / 40,
),
Padding(
padding: const EdgeInsets.only(left: 15.0, right: 15.0),
child: Row(
children: <Widget>[
Container(
height: MediaQuery.of(context).size.height / 13,
width: MediaQuery.of(context).size.width / 2.2,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(5.0),
color: Colors.white,
border: Border.all(color: Colors.black12)),
child: Row(
children: <Widget>[
SizedBox(
width: 18.0,
),
Icon(Icons.tag_faces),
SizedBox(
width: 10.0,
),
Text(
"Facebook",
style: TextStyle(fontSize: 22.0, color: Colors.blue),
),
],
),
),
SizedBox(
width: MediaQuery.of(context).size.width / 40,
),
Container(
height: MediaQuery.of(context).size.height / 13,
width: MediaQuery.of(context).size.width / 2.3,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(5.0),
color: Colors.white,
border: Border.all(color: Colors.black12)),
child: Row(
children: <Widget>[
SizedBox(
width: 18.0,
),
Icon(Icons.tag_faces),
SizedBox(
width: 10.0,
),
Text(
"Google+",
style: TextStyle(fontSize: 22.0, color: Colors.red),
),
],
),
),
],
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 30,
),
Align(
alignment: Alignment.center,
child: InkWell(
onTap: () => Navigator.pop(context),
child: RichText(
text: TextSpan(
text: "Already have an account?",
style: TextStyle(fontSize: 20.0, color: Colors.black87),
children: <TextSpan>[
TextSpan(
text: ' Log in',
style: TextStyle(
color: Color(0xFFD1A155),
fontWeight: FontWeight.bold)),
])),
),
),
SizedBox(
height: MediaQuery.of(context).size.height / 40,
),
],
),
),
);
【问题讨论】：
服务器的规范在哪里说明它需要什么格式的参数？ 应该是表单数据格式 假设它类似于 woocommerce，v2 似乎暗示它使用 GET 而不是 post，并使用 oauth，但我可能错了。您需要查看您尝试访问的 api 的文档。 是的，它的 woocommerce，我正在使用基本身份验证...但我正在使用发布请求 您能否显示该过程的文档链接。 【参考方案1】：错误代码 400 通常由于服务器无法处理的错误请求（即意外参数、格式错误的语法）而发生。如果 cmets 中提到的内容是正确的，并且这里使用的是 woocommerce，那么我无法测试您的设置。但我可以建议在guide 之后在客户端中测试您的配置。 Postman 是一个常用的工具，我可以建议它来测试 HTTP 请求。如果 API 与 Postman 配合良好，但请求在 Flutter 中仍然存在问题，我们可以从那里开始。
【讨论】：
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