关于python：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

Flask - Bad Request The browser (or proxy) sent a request that this server could not understand

本问题已经有最佳答案，请猛点这里访问。

我正在尝试上传文件，并使用flask将数据任务输入MongoDB但我在填写表格和上传图片时出错：

Bad Request
The browser (or proxy) sent a request that this server could not understand.

号

我的HTML代码

1
2
3
4
5
6
7
8
9
10
11

<form class="form-check form-control" method="post" enctype="multipart/form-data" action="{{ url_for('index') }}">
<label>Full Name*</label></td>
<input name="u_name" type="text" class="text-info my-input" required="required" />
<label>Email*</label>
<input name="u_email" type="email" class="text-info my-input" required="required" />
<label>Password*</label>
<input name="u_pass" type="password" class="text-info my-input" required="required" />
<label>Your Image*</label>
<input name="u_img" type="file" class="text-info" required="required" /></td>
<input name="btn_submit" type="submit" class="btn-info" />
</form>

&我的python代码(amp；M)：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

from flask import Flask, render_template, request, url_for
from flask_pymongo import PyMongo
import os
app = Flask(__name__)
app.config['MONGO_DBNAME'] = 'flask_assignment'
app.config['MONGO_URI'] = 'mongodb://<user>:<pass>@<host>:<port>/<database>'
mongo = PyMongo(app)
app_root = os.path.dirname(os.path.abspath(__file__))

@app.route('/', methods=['GET', 'POST'])
def index():
target = os.path.join(app_root, 'static/img/')
if not os.path.isdir(target):
os.mkdir(target)
if request.method == 'POST':
name = request.form['u_name']
password = request.form['u_pass']
email = request.form['u_email']
file_name = ''
for file in request.form['u_img']:
file_name = file.filename
destination = '/'.join([target, file_name])
file.save(destination)
mongo.db.employee_entry.insert({'name': name, 'password': password, 'email': email, 'img_name': file_name})
return render_template('index.html')
else:
return render_template('index.html')

app.run(debug=True)

号

由于访问了request.form中不存在的密钥而导致的BadRequestKeyError错误。

1 2	ipdb> request.form['u_img'] *** BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

上传的文件在request.files下键入，而不是在request.form字典下键入。另外，您需要丢失循环，因为在u_img下键入的值是FileStorage的一个实例，不可重复。

1
2
3
4
5
6
7
8
9
10
11
12
13

@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')

号