[Python] Flask-restful: Did not attempt to load JSON data because the request Content-Type was...

Flask==2.3.3
Werkzeug==2.3.7


I'm trying to get a ms graph subscription going in my app but when I send the subscription request to:

https://graph.microsoft.com/v1.0/subscriptions

and get the follow-up request from ms grap to my endpoint (ValidateSubscription), flask refuses to parse it because of its incorrect mediatype which is text/plain. So far I've tried using flask-accept module to parse the response like this:

class ValidateSubscription(Resource):
@accept('text/plain')
def post:
if flask.request.args.get("validationToken"):
token = flask.request.args.get('validationToken')
return Response(status=200, mimetype='text/plain', response=token)
else:
# process notification
pass


but it didn't work and I got the same error.

Also I've tried to add an api representation to my flask app like this:

@api.representation('text/plain')
def output_text(data, code, headers=None):
resp = flask.make_response(data, code, headers)
resp.headers.extend(headers or {})
return resp


When I print out api.representations I see:

OrderedDict([('application/json', <function output_json at 0x7f872b021424>), ('text/plain', <function output_text at 0x7f8728d04214>)])


And I still get the same exact error without any change whatsoever. Is there a better way to allow flask-restful to accept a text/plain header or am I doing something wrong?

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