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I am working on a project to work on a website that connects to a mysql server using flask and sqlAlchemy (Hosted on AWS RDS) and I am following this tutorial but when I try to do (/api/bar) I get this error. When I just do my localhost:8080 it shows "Hello World" perfectly fine.

sqlalchemy.exc.OperationalError: (pymysql.err.OperationalError) (2003, "Can't connect to MySQL server on 'localhost' ([WinError 10061] No connection could be made because the target machine actively refused it)") (Background on this error at: http://sqlalche.me/e/e3q8)

config.py
database_url = "mysql+pymysql://username:password@localhost:3306/barbeerdrinker"

Here is my __init__.py

from flask import Flask
from flask import jsonify
from flask import make_response
from flask import request
import json

from barbeerdrinker import database

#Flask application
app = Flask(__name__)

@app.route("/")
def hello_world():
 return "Hello World"

@app.route("/api/bar", methods=["GET"])
def get_bars():
 return jsonify(database.get_bars())

@app.route("/api/bar/<name>", methods=["GETS"])
def find_bar(name):
 try:
 if name is None:
 raise ValueError("Bar is not specified")
 bar = database.find_bar(name)
 if bar is None:
 return make_response("No bar found within given name", 404)
 return jsonify(bar)
 except ValueError as e:
 return make_response(str(e), 400)
 except Exception as e:
 return make_response(str(e), 500) 

@app.route("/api/beers_cheaper_than", methods=["POST"])
def find_beers_cheaper_than():
 body = json.loads(request.data)
 max_price = body['maxPrice']
 return jsonify(database.filter_beers(max_price)) 

database.py

from sqlalchemy import create_engine
from sqlalchemy import sql

from barbeerdrinker import config

engine = create_engine(config.database_url)

def get_bars():
 with engine.connect() as con:
 rs = con.execute("SELECT name, address, city, opening, closing, phoneNum FROM bars")
 return [dict(row) for row in rs]

def find_bar(name):
 with engine.connect() as con:
 query = sql.text("SELECT * FROM bars WHERE name = :name;")
 rs = con.execute(query, name=name)
 result = rs.first()
 if result is None:
 return None
 return dict(result)

def filter_beers(max_price):
 with engine.connect() as con:
 query = sql.text("SELECT * FROM sells WHERE price < : max_price;")
 rs = con.execute(query, max_price=max_price)
 results = [dict(row) for row in rs]
 for r in results:
 r['price'] = float(r['price'])
 return results

**Edit: So it seems like the problem is not an issue with my code but a Windows error. One solution I tried to do was to open up the required ports through my firewall to no avail.

I just figured it out, turns out the issue is not a windows issue. The problem is within my config.py:

Instead of:
database_url = "mysql+pymysql://username:password@localhost:3306/barbeerdrinker"

It should be:
database_url = "mysql+pymysql://username:password@**AWSENDPOINT/HOSTNAME**:3306/barbeerdrinker"