Redis – How can the following issue be resolved in flask? "Method Not Allowed The method is not allowed for the requested URL"

Here is the code

import os
import redis
import flask
import json
import urllib.parse
from flask import Flask, Response, request, render_template, abort
from flask_cors import CORS, cross_origin
#from flask.ext.cors import CORS, cross_origin

app = Flask(__name__)
app.config['CORS_HEADERS'] = 'Content-Type'
redis_handle = redis.Redis('localhost')
requiredFields = ("id", "title", "name")  # fields required for user object


@app.route('/')
@cross_origin()
def hello():
    return 'Hello World!'


@app.route('/users/<user_id>', methods=['GET'])
@cross_origin()
def get_user(user_id):
    response = {}
    # user_id = request.args.get("id")
    user = redis_handle.get(user_id)
    if not user:
        response["msg"] = "no user found"
        return Response(json.dumps(response), status=404, mimetype="application/json")
    return user


@app.route('/users', methods=['POST'])
@cross_origin()
def save_user():
    data = request.get_json(force=True)
    response = {}
    if all(field in data for field in requiredFields):
        redis_handle.set(data["id"], json.dumps(data))
        return Response(status=201)
    else:
        missing_key = str([val for val in requiredFields if val not in dict(data).keys()])
        response["msg"] = "required key " + missing_key + " not found"
        return Response(json.dumps(response), status=400)


@app.route('/users/<user_id>', methods=['DELETE'])
@cross_origin()
def delete_user(user_id):
    response = {}
    resp = redis_handle.delete(user_id)
    if resp == 0:
        response["msg"] = "no such entity found"
        status = 404
    else:
        response["msg"] = "Delete op is successful"
        status = 200
    return Response(json.dumps(response), status=status)


@app.route('/clear', methods=['GET'])
@cross_origin()
def clear_data():
    redis_handle.flushall()
    return "ok!"


if __name__ == "__main__":
    app.run(debug=True)

As of my knowledge, I have even included the method = "POST" as well but still don’t know what is going wrong.

I tried to create a small crud application using redis, python, flask but couldn’t encountering this issue. Can someone tell me where and what am I doing wrong?