There is a Server Error 500 error when trying to add an article from the admin panel, somehow connected with the transition to http2, the logs do not help, where to dig?

Question

Django

Moved the site to http2 with a certificate from Let's Encript. After that, when I try to add an article (using CKEditor) via Django Admin (add/post), a Server Error 500 occurs. Tags, categories, images are easily added to the server. Nginx, Gunicorn logs switched to Debug mode do not give any information. Where to dig? I have a suspicion that the error may be somehow related to the transfer of html code from the add / post form, maybe some kind of escaping. I'm at a dead end.

Answer 1

Set up logging once in production and catch errors by mail.
Does anyone even read the documentation?

ADMINS = (('Your nam.', '[email protected]'),)
...
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'smtp.yandex.ru' # or google
EMAIL_HOST_PASSWORD = 'password'
EMAIL_HOST_USER = 'login'
DEFAULT_FROM_EMAIL = EMAIL_HOST_USER
SERVER_EMAIL = DEFAULT_FROM_EMAIL
EMAIL_PORT = 465
EMAIL_USE_SSL = True
...
LOGGING = {
    'version': 1,
    'disable_existing_loggers': True,
    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s '
                      '%(process)d %(thread)d %(message)s'
        },
        'simple': {
            'format': '%(levelname)s %(message)s'
        },
    },
    'handlers': {
        'null': {
            'level': 'DEBUG',
            'class': 'django.utils.log.NullHandler',
        },
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',
            'formatter': 'simple'
        },
        'mail_admins': {
            'level': 'ERROR',
            'class': 'django.utils.log.AdminEmailHandler',
            'include_html': True,
        }
    },
    'loggers': {
        'django': {
            'handlers': ['console'],
            'propagate': True,
            'level': 'INFO',
        },
        'django.db': {
            'level': 'DEBUG',
            'handlers': ['console'],
            'propagate': True,
        },
        'django.request': {
            'handlers': ['mail_admins', 'console'],
            'level': 'ERROR',
            'propagate': False,
        },
    }
}

Answer 2

Thank you all, the issue was resolved when I started a user other than root.