Falta el origen en Cors_origin_Whitelist
CORS_ORIGIN_WHITELIST = [
'http://localhost:3000',
'http://localhost:8000',
'http://localhost:8080',
]
MitchAloha
CORS_ORIGIN_WHITELIST = [
'http://localhost:3000',
'http://localhost:8000',
'http://localhost:8080',
]