表达：在请求请求时，req.body为空（findOneAndReplace）

Question

在我的express / node / mongodb服务器应用程序上，我的行为异常， 似乎只有当我使用findOneAndReplace方法调用PUT请求时，此请求看起来才是空的。

实际上我有以下错误消息用于验证方法：

此处是代码：

const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const app = express();
const methodOverride = require('method-override');
const session = require('express-session');
const passport = require('passport');
const logger = require('morgan');
const cors = require('cors');

//MODEL
const Clienti = require('./model/clienti');

app.use(bodyParser.urlencoded({limit: '10mb', extended: false}));
app.use(methodOverride('_method'));
app.use(bodyParser.json({limit: '10mb'}));


//UPDATE
app.put('/api/aggiorna_cliente/:id', function(req, res, next) {
console.log(JSON.stringify(req.body))   --> N.B. i have the correct body rendition here 
console.log(JSON.stringify(req.params.id))
Clienti.findOneAndReplace(
    { _id:req.params.id },
    {
        address:req.body.address,
        brand:req.body.brand,
        cap:req.body.cap,
        city:req.body.city,
        civico:req.body.civico,
        email:req.body.email,
        fiscalcode:req.body.fiscalcode,
        provincia:req.body.provincia,
        utente:req.body.utente
    }, 
    function (err, post) {
        if (err) return next(err);
        res.json(post);
    });
});

此处为CLIENTI模型 const mongoose = require（'mongoose'）;

        const clientiSchema = mongoose.Schema({
            utente:{
                type: String,
                required:true
            },
            cap:{
                type: Number,
                required:true

            },
            civico:{
                type: String,
                required:true

            },
            city:{
                type: String,
                required:true

            },  
            address:{
                type: String,
                required:true
            },
            fiscalcode:{
                type:String,
                required:true
            },
            email:{
                type:String,
                required:true
            },      
            brand:{
                type:String,
                required:true
            },      
            provincia:{
                province: String,
                sigle: String
            }
        });

        const Clienti = mongoose.model('Clienti',clientiSchema);
        module.exports = Clienti

如您所见，几乎所有字段都是“必填”的，这导致了上图的验证问题。

但是，如果我删除了必填字段，则所有数据均为空（id除外）

我在angular中使用服务的最后方式

    updateCustomer(customer){
    let headers = new Headers();
    headers.append('Content-Type', 'application/json');
    return this.http.put(this.UpdateCustomer+'/'+customer._id, JSON.stringify(customer), {headers: headers})
    .map((response: Response) => response.json())
}

那会是什么？

谢谢您的时间