Flask-错误请求浏览器(或代理)发送了此服务器无法理解的请求

BadRequestKeyError由于访问不存在的密钥而导致的错误request.form.

ipdb> request.form['u_img']
*** BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

上传的文件是键入的request.files而不是request.form字典.此外,您需要丢失循环,因为键入的值u_img是一个实例FileStorage而不是可迭代的.

@app.route('/', methods=['GET', 'POST'])
def index():
    target = os.path.join(app_root, 'static/img/')
    if not os.path.isdir(target):
        os.makedirs(target)
    if request.method == 'POST':
        ...
        file = request.files['u_img']
        file_name = file.filename or ''
        destination = '/'.join([target, file_name])
        file.save(destination)
        ...
    return render_template('index.html')