我對 Flask 處于初學者水平，正在嘗試創建一個網絡應用程序。用戶將從文件資源管理器上傳照片，圖像將顯示在屏幕上（感謝我在這里找到的答案）。我的問題是，當我在確認頁面單擊“返回”時，我想重定向到文件上傳頁面（http://127.0.0.1:5000/upload），但它似乎根本不起作用。網址發生變化，但頁面仍處于 /uploadconfirmation 頁面，詢問用戶是否要繼續。我不確定這是否是由于我發現顯示圖像的代碼所致。任何幫助表示贊賞！圖片：代碼：main.pyimport osfrom flask import Flask, flash, request, redirect, url_for, render_template, send_from_directoryfrom werkzeug.utils import secure_filenameUPLOAD_FOLDER = 'C:/Users/yurik/OneDrive/FYPCode/code+images/FullProject/imagesUploaded'ALLOWED_EXTENSIONS = set(['png', 'jpg', 'jpeg', 'gif'])app = Flask(__name__)app.secret_key = "secret key"app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER# specifies max file size = 16MBapp.config['MAX_CONTENT_LENGTH'] = 16 * 1024 * 1024def allowed_file(filename):    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS# HOME:#index method,returns [email protected]('/home')def index():                                 return render_template('index.html')# UPLOAD FILE:  @app.route('/upload')def upload_page():    return render_template('upload.html')@app.route('/', methods=['POST'])def upload_file():    if request.method == 'POST':        # check if the post request has the file part        if 'file' not in request.files:            flash('No file part')            return redirect(request.url)        file = request.files['file']        if file.filename == '':            flash('No file selected for uploading')            return redirect(request.url)        # file is uploaded to imagesUploaded folder in FullProject        if file and allowed_file(file.filename):            filename = secure_filename(file.filename)            file.save(os.path.join(app.config['UPLOAD_FOLDER'], filename))            return redirect(url_for('file_confirm', filename=filename))        else:            flash('Allowed file types are png, jpg, jpeg, gif')            return redirect(request.url)