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问题：

Flask：创建没有表单的上传服务器[重复]

东郭良弼
2023-03-14

我写了一个小烧瓶服务器。目的是上传文件。重要的是，这是一个只有REST API的服务器，不呈现html和模板文件。

这是代码：

from flask import Flask, render_template, request, redirect, url_for

app = Flask(__name__)

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/', methods=['POST'])
def upload_file():
    uploaded_file = request.files['file']
    if uploaded_file.filename != '':
        uploaded_file.save(uploaded_file.filename)
    return redirect(url_for('index'))
    
if __name__ == "__main__":
    app.run(debug=True)

curl -X POST -d file=/home/user1/Desktop/STEP_files/MyFile.txt 127.0.0.1:5000

  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/werkzeug/datastructures.py", line 442, in __getitem__
    raise exceptions.BadRequestKeyError(key)
werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/user1/Desktop/flaskServer/server.py", line 11, in upload_file
    uploaded_file = request.files['file']
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/debughelpers.py", line 100, in __getitem__
    raise DebugFilesKeyError(request, key)
flask.debughelpers.DebugFilesKeyError: You tried to access the file "file" in the request.files dictionary but it does not exist.  The mimetype for the request is "application/x-www-form-urlencoded" instead of "multipart/form-data" which means that no file contents were transmitted.  To fix this error you should provide enctype="multipart/form-data" in your form.

The browser instead transmitted some file names. This was submitted: "/home/user1/Desktop/STEP_files/MyFile.txt"

127.0.0.1 - - [02/Feb/2021 16:49:37] "POST / HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/user1/Desktop/flaskServer/server.py", line 11, in upload_file
    uploaded_file = request.files['file']
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/werkzeug/datastructures.py", line 442, in __getitem__
    raise exceptions.BadRequestKeyError(key)
werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.
KeyError: 'file'

如果执行curl-x post-d“file=@/home/user1/desktop/step_files/myfile.txt”127.0.0.1:5000

我得到：

127.0.0.1 - - [02/Feb/2021 16:53:11] "POST / HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/debughelpers.py", line 96, in __getitem__
    return oldcls.__getitem__(self, key)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/werkzeug/datastructures.py", line 442, in __getitem__
    raise exceptions.BadRequestKeyError(key)
werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/user1/Desktop/flaskServer/server.py", line 11, in upload_file
    uploaded_file = request.files['file']
  File "/home/user1/anaconda3/envs/flaskTest/lib/python3.9/site-packages/flask/debughelpers.py", line 100, in __getitem__
    raise DebugFilesKeyError(request, key)
flask.debughelpers.DebugFilesKeyError: You tried to access the file "file" in the request.files dictionary but it does not exist.  The mimetype for the request is "application/x-www-form-urlencoded" instead of "multipart/form-data" which means that no file contents were transmitted.  To fix this error you should provide enctype="multipart/form-data" in your form.

The browser instead transmitted some file names. This was submitted: "@/home/user1/Desktop/STEP_files/Assembly_Test.step"

共有1个答案

冯宏浚
2023-03-14

这里的问题是Curl命令，而不是Flask实现，使用-f发送多部分/表单数据请求，使用@snytax Accaccy发送文件，而不是将文件名作为字符串。

curl -X POST -F file=@/home/user1/Desktop/STEP_files/MyFile.txt 127.0.0.1:5000
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