表达 js, req.body with bodyParser 为空或未定义

我试图从expressJs中的api获取数据。我正在使用“请求”。我会通过一个表单发送请求，用户可以在其中选择要查找的电影标题。我不明白为什么 req.body.title 是空的。我也尝试过 req.params.title 但不起作用

谢谢你的帮助

这是 search.ejs 文件

<div class="container">
    <div class="row">
    <div class="col-md-4">
        <form action="/search" method="GET">
            <div class="form-group">
                <label for="">Keyword to search</label>
                <input class="form-control" type="text" placeholder="e.g. Harry Potter" name="lang">
            </div>
            <div class="form-group">
                    <label for="">Keyword to search</label>
                    <input class="form-control" type="text" placeholder="e.g. Harry Potter" name="title">
            </div>
            <div class="form-group">
                <input type="submit" class="btn btn-primary">
            </div>
        </form>
    </div>
    <div class="col-md-8">
        <p>title</p>
        <p> <% film.forEach((singleMovie) => { %>
            <p> <%= singleMovie.title %></p>
        <% }) %> </p>
    </div>
</div>

这是 app.js

我想将名称为 title 的输入文本字段的值传递给变量 filmName，之后用户将被重定向到同一页面，搜索结果位于页面右侧

    //APP VARIABLES AND IMPORTING
var express = require('express');
var bodyParser = require('body-parser');
var mongoose = require('mongoose');
var request = require('request');
var app = express();
app.set('view engine', 'ejs');
app.use(express.static('public'));
app.use(bodyParser.urlencoded({extended: true}));
mongoose.connect('mongodb://localhost/film_database', {useMongoClient: true});
mongoose.Promise = global.Promise;

//BASIC ROUTE
app.get('/', (req, res) => {
    res.render('index');
});

app.get('/search', (req, res) => {
    var filmName = req.body.title; => this should return the input text
    console.log(filmName);
    var baseAPIAddress = "https://api.themoviedb.org/3"
    var searchAPI= "/search/movie?api_key={my_api_key}&language=fr&query=" + filmName + "&include_adult=false"
    var searchRequest = baseAPIAddress + searchAPI;
    var film = {};

    request(searchRequest, (err, resp, body) => {
         if (!err && res.statusCode == 200) {
            var film = JSON.parse(body);
            var titleArray = film['results']
            res.redirect('search', {film: titleArray});
        } else {
            console.log('err is: ' + err);
        }
    });

});

//GET => index.js => /search

///SERVER
app.listen(3000, () => {
    console.log('SERVER IS RUNNING AT LOCALHOST://3000');
d});

我不知道为什么我无法获得输入值，我尝试了不同的方法但没有奏效。我认为 GET 是正确的，因为我不想修改任何数据。