[Fixed]-You may need to add u'127.0.0.1' to ALLOWED_HOSTS

If after adding ‘*’ it still doesn’t work, you have to find ‘request.py’ file in venv and add your host by yourself: allowed_hosts = "your host"

My solution, my env file template with comments, in settings.py should be as shown in commented examples

# ENV  file template, 
# Install:   pip install python-decouple

# Your Django app secret key without '' or " ", in Django  settings.py  should be as follow:
# SECRET_KEY = config('SECRET_KEY')

SECRET_KEY=secret-key

# Debug state, in Django  settings.py  should be as follow:
# DEBUG = config('DEBUG')

DEBUG=1

# Allowed Hosts in Django  settings.py  should be as follow:
# ALLOWED_HOSTS = [config('ALLOWED_HOST_1'),config('ALLOWED_HOST_2'),config('ALLOWED_HOST_3')]

ALLOWED_HOST_1=127.0.0.1
ALLOWED_HOST_2=192.168.99.100
ALLOWED_HOST_3=localhost

## Settings for Docker SQL postgress, dont use " "

SQL_ENGINE=django.db.backends.postgresql
SQL_DATABASE=api_db
SQL_USER=api-api-user
SQL_PASSWORD=api-pass
SQL_HOST=db
SQL_PORT=5432


## In Django settings.py should be as follow: 

# DATABASES = {
#     "default": {
#         "ENGINE": config('SQL_ENGINE'),
#         "NAME": config('SQL_DATABASE'),
#         "USER": config('SQL_USER'),
#         "PASSWORD": config('SQL_PASSWORD'),
#         "HOST": config('SQL_HOST'),
#         "PORT": config('SQL_PORT'),
#     }
# }

Check if you have another proyect running, this was my issue xd