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터미널에   KeyError: 'bucket_give'   는 무엇인가요?

맨 아래 2째 줄입니다.

127.0.0.1 - - [05/Feb/2023 19:53:30] "GET / HTTP/1.1" 200 -

127.0.0.1 - - [05/Feb/2023 19:53:30] "GET /bucket HTTP/1.1" 200 -

127.0.0.1 - - [05/Feb/2023 19:54:27] "GET / HTTP/1.1" 200 -

127.0.0.1 - - [05/Feb/2023 19:54:28] "GET /bucket HTTP/1.1" 200 -

127.0.0.1 - - [05/Feb/2023 19:54:58] "POST /bucket HTTP/1.1" 500 -

Traceback (most recent call last):

 File "C:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\venv\lib\site-packages\flask\app.py", line 2548, in __call__

  return self.wsgi_app(environ, start_response)

 File "C:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\venv\lib\site-packages\flask\app.py", line 2528, in wsgi_app

  response = self.handle_exception(e)

 File "C:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\venv\lib\site-packages\flask\app.py", line 2525, in wsgi_app

  response = self.full_dispatch_request()

 File "C:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\venv\lib\site-packages\flask\app.py", line 1822, in full_dispatch_request

  rv = self.handle_user_exception(e)

 File "C:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\venv\lib\site-packages\flask\app.py", line 1820, in full_dispatch_request

  rv = self.dispatch_request()

 File "C:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\venv\lib\site-packages\flask\app.py", line 1796, in dispatch_request

  return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)

 File "c:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\app.py", line 14, in bucket_post   

  bucket_receive = request.form['bucket_give']

 File "C:\Users\haeso\Desktop\SPARTA-SEAWATER2034\projects\04.bucket\venv\lib\site-packages\werkzeug\datastructures.py", line 375, 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: 'bucket_give'

 * Detected change in 'c:\\Users\\haeso\\Desktop\\SPARTA-SEAWATER2034\\projects\\04.bucket\\app.py', reloading