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我正在关注Flask教程以进行图片上传。我还决定修改一下，以便我可以添加其他功能。该网站加载本地，但是当我上传按钮实际点击（选择PNG图片）之后，我收到以下错误：上传图片烧瓶错误
Bad Request. The browser (or proxy) sent a request that this server could not understand.
我读过一些关于这里添加一个else语句： Form sending error, Flask 但我不确定如何满足我的需求。 这里是我的代码：
from flask import Flask, request, session, g, redirect, url_for, \
abort, render_template, flash
from werkzeug import secure_filename
import os
DEBUG = True
SECRET_KEY = 'development key'
USERNAME = 'admin'
PASSWORD = 'default'
#Add parameters for image uploads:
UPLOAD_FOLDER = '/upload_folder/'
ALLOWED_EXTENSIONS = set(['png','jpg','jpeg'])
app = Flask(__name__)
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
#@app.route('/')
#@app.route('/<name>')
#Image uploads:
def allowed_file(filename):
return '.' in filename and \
filename.rsplit('.',1)[1] in ALLOWED_EXTENSIONS
@app.route('/',methods=['GET','POST'])
def upload_file():
if request.method == 'POST':
file = request.files['file']
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('uploaded_file',filename=filename))
return '''
<!doctype html>
<title>Upload new File</title>
<h1>UPload new File</h1>
<form action="" method=post enctype=multpart/form-data>
<p><input type=file name=file>
<input type=submit value=Upload>
</form>
'''
#Handle errors:
@app.errorhandler(404)
def page_not_found(error):
return render_template('page_not_found.html'),404
#render template:
def flaskr(name=None):
return render_template('hello.html',name=name)
#Handle errors:
@app.errorhandler(404)
def page_not_found(error):
return render_template('page_not_found.html'),404
if __name__ == '__main__':
app.run()