Question

我正在尝试使用请求模块将数据发送到后端（快速），但是快速后处理程序正在打印正文未定义。并且快递正在发送404（错误请求）。（注意：-我已经激活了跨域资源共享）

我的React代码：-

const submitHandler = (e) =>{ 
e.preventDefault();    
//const url = 'http://localhost:3001/user/login';    
const response = new Promise((resolve,reject)=>{    
let options = {    
 email: 'me@example.com',    
 password: 'myPassword'    
};    
const data = JSON.stringify(options);    
submit === true ? 
request.post({url:'http://localhost:3001/user/login',headers:{'content- 
type' : 'application/x-www-form-urlencoded'},body:data},(error,res)=>{    
  resolve(res);
}) :    
 reject('something went wrong!')
});    

response.then((res)=>{    
console.log(res)    
}).catch((e)=>{    
 console.log(e);    
 })    
}

我的Express代码：-

app.post('/user/login',(req,res)=>{    
console.log(req)    
try{    
 const data = JSON.parse(req)    
 console.log('POST request initiated !',data.body);    
 console.log(data);    
 res.send('Post request got it! ',+data);    
}catch(e){    
 res.status(400).send('Bad Request !');    
 }    
})    

app.listen(port,()=>{    
 console.log('Server is running at PORT ',port)    
})

输出为：-
正文：{}，
  路线：
   路线{
     路径：“ / user / login”，
     堆栈：[[Layer]]，
     方法：{post：true}}

Answer 1

您可以在Express中使用内置的json中间件，这样就不必单独解析每个请求：

df.loc[:,'direction'] = np.NaN
df.loc[df.index == 0, "direction"] = "WEST"
# mask is for finding when a signal hasnt changed in three seconds, but now has
mask = (df.trajectory != df.trajectory.shift(1)) & (df.trajectory == df.trajectory.shift(-1)) & (df.trajectory == df.trajectory.shift(-2))
df.loc[(mask) & (df['trajectory'] == 'LEFT') & (df['direction'].dropna().shift() == "WEST"),'direction'] = 'SOUTH'
df.loc[(mask) & (df['trajectory'] == 'LEFT') & (df['direction'].dropna().shift() == "SOUTH"),'direction'] = 'EAST'
df.loc[(mask) & (df['trajectory'] == 'LEFT') & (df['direction'].dropna().shift() == "EAST"),'direction'] = 'NORTH'
df.loc[(mask) & (df['trajectory'] == 'LEFT') & (df['direction'].dropna().shift() == "NORTH"),'direction'] = 'WEST'
df.loc[(mask) & (df['trajectory'] == 'RIGHT') & (df['direction'].dropna().shift() == "WEST"),'direction'] = 'NORTH'
df.loc[(mask) & (df['trajectory'] == 'RIGHT') & (df['direction'].dropna().shift() == "SOUTH"),'direction'] = 'WEST'
df.loc[(mask) & (df['trajectory'] == 'RIGHT') & (df['direction'].dropna().shift() == "EAST"),'direction'] = 'SOUTH'
df.loc[(mask) & (df['trajectory'] == 'RIGHT') & (df['direction'].dropna().shift() == "NORTH"),'direction'] = 'EAST'
df.loc[:,'direction'] = df.direction.fillna(method="ffill")
print(df[['trajectory','direction']])

使用它后，您可以在request.body属性中访问帖子数据。

顺便说一句，由于尝试解析不是json格式的整个请求对象，因此出现了错误。

请求帖子正文未传递到Express Post Handler

1 个答案: