[Python] Flask not accepting form

I am trying to send to a flask app a simple form from python, with this requests:

r = requests.post('http://x.x.x.x/Files',data = {
'FileName': filename,
'Mode' : 'Add'
})


flask app is handling it by this way:

api.add_resource(GetFiles, '/Files')
class GetFiles(Resource):
def post(self):
args = ParseArgs.parse_args()
if '.txt' not in args['FileName']:
FileName = f'{args["FileName"]}.txt'
else:
FileName = args['FileName']


but I can't understand why, on every single request I am getting this response:

{ "message": "Did not attempt to load JSON data because the request Content-Type was not 'application/json'." }

I tried by setting application-json as content-type but with this result: { "message": "Failed to decode JSON object: Expecting value: line 1 column 1 (char 0)" } in fact it wouldn't have made much sense since I'm submitting a form, but at least I tried.

I don't really understand why, I've used this app several times and it never did before, I don't know if it could be due to a new flask update since I just moved to another server and I'm using a docker container.

Thanks in advance for the help.

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