Express Body-parser文件上传大小限制不起作用

Question

我的快递：

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var less = require("express-less")

var session = require("express-session")
var FileStore = require("session-file-store")(session)

var router = require('./router');

var app = express();

var bodyParser = require('body-parser');
app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({limit: '50mb', extended: true}));

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use('/css', less(__dirname + '/less'));

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use(session({
  secret: "secret message that is obviously not the one i'm using in my code",
    resave: true,
    saveUninitialized: true
}));

app.use('/', router);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

（这只是快速生成器生成的代码，但增加了一些内容）

行

app.use(bodyParser.json({limit: '50mb'}));
app.use(bodyParser.urlencoded({limit: '50mb', extended: true}));

应该将最大限制设置为我设置的最大限度，但是，我已经远程搜索了互联网并且还没有遇到可行的解决方案。当我通过XMLHttpRequest向服务器发送大于100kb的图像时，我得到413（有效负载太大）错误。

我还建议我使用'MB'代替'mb'，但这不起作用。