500 Response error when creating playlist

[11150105713]

My task is to build a program that first scraps songs from billboard.com, and then uses the Spotify API to search for these songs and create a playlist.

The scrapping part and seach parts are working. The problem arises when I try to create a playlist.

Every time the code for create_playlist runs I get a 500 error. I am not sure if the error comes from calling (in spotify.py):

requests.get('http://localhost:5000/createplaylist', params=params)

or (in spotify_service.py)

requests.post(url, headers=headers, params=params)

I don't know if the error it's from my flask server or from Spotify or if there is a mistake in the code.

I was hoping someone could spot the problem.

Here are the files (I've also attached them just in case)

main.py

from data_scrapper import DataScrapper
from spotify import Spotify

BILLBOARD_URL = 'https://www.billboard.com/charts/hot-100/'


class Application:
    def __init__(self):
        # self.data_scrapper = DataScrapper(BILLBOARD_URL)
        # self.user_input = input("Enter a date for the top 100 (YYYY-MM-DD)")
        # self.song_list = self.data_scrapper.scrap_songs('1992-08-12')
        self.spotify = Spotify()
        self.spotify.create_playlist('1992', 'Collection of the Greatest hits of 1992', False)
        # self.spotify.get_playlist('2QUpzT3uDaRXnhzcPqLF7F')
        # self.spotify.search_song()


app = Application()

spotify.py

import base64

import requests
import json


class Spotify:
    def __init__(self):
        pass

    def create_playlist(self, year, description, public):
        name = f'Greatest hits of {year}'
        params = {
            'name': name,
            'public': public,
            'description': description
        }

        response = requests.get('http://localhost:5000/createplaylist', params=params)
        response.raise_for_status()
        print(response.json())

    def get_playlist(self, playlist_id):
        params = {
            'playlist_id': playlist_id
        }
        response = requests.get('http://localhost:5000/getplaylist', params=params)
        print(response.json())
        return response.json()

    def search_song(self):
        params = {
            'song': 'Set fire to the rain'
        }
        response = requests.get('http://localhost:5000/searchsong', params=params)
        print(json.loads(response.text)['tracks']['items'][0]['uri'])
        return json.loads(response.text)['tracks']['items'][0]['uri']

spotify_service.py

from flask import Flask, request, redirect
from requests_oauthlib import OAuth2Session
from requests.auth import HTTPBasicAuth
import os
import requests
import json

app = Flask(__name__)

AUTH_URL = 'https://accounts.spotify.com/authorize'
TOKEN_URL = 'https://accounts.spotify.com/api/token'
SEARCH_URL = 'https://api.spotify.com/v1/search'
REDIRECT_URI = 'http://localhost:5000/callback'
CLIENT_ID = xxx
CLIENT_SECRET = xxx
USER_ID = xxx

SCOPE = [
    'user-read-currently-playing',
    'playlist-modify-private'
]


@app.route("/login")
def login():
    spotify = OAuth2Session(client_id=CLIENT_ID, scope=SCOPE[1], redirect_uri=REDIRECT_URI)
    authorization_url, state = spotify.authorization_url(AUTH_URL)
    return redirect(authorization_url)


@app.route("/callback", methods=['GET'])
def callback():
    code = request.args.get('code')
    response = requests.post(TOKEN_URL,
                             auth=HTTPBasicAuth(CLIENT_ID, CLIENT_SECRET),
                             data={
                                 'grant_type': 'authorization_code',
                                 'code': code,
                                 'redirect_uri': REDIRECT_URI
                             })

    os.environ['ACCESS_TOKEN'] = response.json()['access_token']

    return "Logged in"


@app.route('/getplaylist', methods=['GET'])
def getplaylist():
    playlist_id = request.args.get('playlist_id')

    headers = {
        'Authorization': "Bearer {}".format(os.environ['ACCESS_TOKEN'])
    }

    url = f'https://api.spotify.com/v1/playlists/{playlist_id}'
    response = requests.get(url, headers=headers)
    results = response.json()
    songs = []
    for item in results['tracks']['items']:
        if item is not None and item['track']['artists'][0] is not None:
            songs.append(item['track']['artists'][0]['name'] + " : " + item['track']['name'])
    return json.dumps(songs)


@app.route("/createplaylist", methods=['GET'])
def createplaylist():
    url = 'https://api.spotify.com/v1/users/{}/playlists'.format(USER_ID)

    headers = {
        'Authorization': "Bearer {}".format(os.environ['ACCESS_TOKEN']),
        'Content-Type': 'application/json'
    }

    params = {
        'name': request.args.get('name'),
        'public': request.args.get('public'),
        'description': request.args.get('description')
    }

    response = requests.post(url, headers=headers, params=params)
    response.raise_for_status()
    return response


@app.route("/searchsong", methods=['GET'])
def searchsong():
    song = request.args.get('song')

    headers = {
        'Authorization': "Bearer {}".format(os.environ['ACCESS_TOKEN'])
    }

    params = {
        'q': song,
        'type': 'track',
        'market': 'ES',
        'limit': 1
    }

    response = requests.get(SEARCH_URL, headers=headers, params=params)
    response.raise_for_status()
    return response.text


if __name__ == '__main__':
    app.run(port=5000, debug=True)

Thank you in advance -