Issue 1:
I have checked the issues list

for similar or identical bug reports.

I have checked the pull requests list

for existing proposed fixes.

I have checked the commit log

to find out if the bug was already fixed in the master branch.

I have included all related issues and possible duplicate issues in this issue

(If there are none, check this box anyway).

Related Issues and Possible Duplicates

Related Issues

None

Possible Duplicates

None

Description

Google links to the HTTPS version of the website

Which gets you a nice big

Chrome is a little clearer, seems to be RTFD has given you the wrong cert:

Issue 2:
Checklist

I have verified that the issue exists against the master branch of Celery. (I cannot test this because it's a production server)

This has already been asked to the discussion group first.

I have read the relevant section in the

contribution guide

on reporting bugs.

I have checked the issues list

for similar or identical bug reports.

I have checked the pull requests list

for existing proposed fixes.

I have checked the commit log

to find out if the bug was already fixed in the master branch.

I have included all related issues and possible duplicate issues

in this issue (If there are none, check this box anyway).

Mandatory Debugging Information

I have included the output of celery -A proj report in the issue.

(if you are not able to do this, then at least specify the Celery

version affected).

I have verified that the issue exists against the master branch of Celery. (I cannot test this because it's a production server)

I have included the contents of pip freeze in the issue.

I have included all the versions of all the external dependencies required

to reproduce this bug.

Optional Debugging Information

I have tried reproducing the issue on more than one Python version

and/or implementation.

I have tried reproducing the issue on more than one message broker and/or

result backend.

I have tried reproducing the issue on more than one version of the message

broker and/or result backend.

I have tried reproducing the issue on more than one operating system.

I have tried reproducing the issue on more than one workers pool.

I have tried reproducing the issue with autoscaling, retries,

ETA/Countdown & rate limits disabled.

I have tried reproducing the issue after downgrading

and/or upgrading Celery and its dependencies.

Related Issues and Possible Duplicates

Related Issues

None

Possible Duplicates

#4480 (But that issue is about the AMQP broker, and I'm using Redis)

Environment & Settings

Celery version: 4.4.7 (cliffs)

celery report Output:

software -> celery:4.4.7 (cliffs) kombu:4.6.11 py:3.6.9
billiard:3.6.3.0 redis:3.5.3
platform -> system:Linux arch:64bit, ELF
kernel version:4.15.0-115-generic imp:CPython
loader -> celery.loaders.app.AppLoader
settings -> transport:redis results:redis+socket:///var/run/redis/redis-server.sock

ABSOLUTE_URL_OVERRIDES: {
}
ADMINS: []
ALLOWED_HOSTS: ['proj.com']
APPEND_SLASH: True
AUTHENTICATION_BACKENDS: ['django.contrib.auth.backends.ModelBackend']
AUTH_PASSWORD_VALIDATORS: '********'
AUTH_USER_MODEL: 'accounts.CustomUser'
BASE_DIR: '/home/proj/website'
CACHES: {
'default': { 'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
'LOCATION': 'unix:/var/run/memcached/memcached.sock'}}
CACHE_MIDDLEWARE_ALIAS: 'default'
CACHE_MIDDLEWARE_KEY_PREFIX: '********'
CACHE_MIDDLEWARE_SECONDS: 600
CELERY_BROKER_URL: 'redis+socket:///var/run/redis/redis-server.sock'
CELERY_RESULT_BACKEND: 'redis+socket:///var/run/redis/redis-server.sock'
CSRF_COOKIE_AGE: 31449600
CSRF_COOKIE_DOMAIN: None
CSRF_COOKIE_HTTPONLY: False
CSRF_COOKIE_NAME: 'csrftoken'
CSRF_COOKIE_PATH: '/'
CSRF_COOKIE_SAMESITE: 'Lax'
CSRF_COOKIE_SECURE: False
CSRF_FAILURE_VIEW: 'django.views.csrf.csrf_failure'
CSRF_HEADER_NAME: 'HTTP_X_CSRFTOKEN'
CSRF_TRUSTED_ORIGINS: []
CSRF_USE_SESSIONS: False
DATABASES: {
'default': { 'ATOMIC_REQUESTS': False,
'AUTOCOMMIT': True,
'CONN_MAX_AGE': 0,
'ENGINE': 'django.db.backends.postgresql',
'HOST': 'localhost',
'NAME': 'proj',
'OPTIONS': {},
'PASSWORD': '********',
'PORT': '',
'TEST': { 'CHARSET': None,
'COLLATION': None,
'MIRROR': None,
'NAME': None},
'TIME_ZONE': None,
'USER': 'postgres'}}
DATABASE_ROUTERS: '********'
DATA_UPLOAD_MAX_MEMORY_SIZE: 2621440
DATA_UPLOAD_MAX_NUMBER_FIELDS: 1000
DATETIME_FORMAT: 'N j, Y, P'
DATETIME_INPUT_FORMATS: ['%Y-%m-%d %H:%M:%S',
'%Y-%m-%d %H:%M:%S.%f',
'%Y-%m-%d %H:%M',
'%Y-%m-%d',
'%m/%d/%Y %H:%M:%S',
'%m/%d/%Y %H:%M:%S.%f',
'%m/%d/%Y %H:%M',
'%m/%d/%Y',
'%m/%d/%y %H:%M:%S',
'%m/%d/%y %H:%M:%S.%f',
'%m/%d/%y %H:%M',
'%m/%d/%y']
DATE_FORMAT: 'N j, Y'
DATE_INPUT_FORMATS: ['%Y-%m-%d',
'%m/%d/%Y',
'%m/%d/%y',
'%b %d %Y',
'%b %d, %Y',
'%d %b %Y',
'%d %b, %Y',
'%B %d %Y',
'%B %d, %Y',
'%d %B %Y',
'%d %B, %Y']
DEBUG: False
DEBUG_PROPAGATE_EXCEPTIONS: False
DECIMAL_SEPARATOR: '.'
DEFAULT_CHARSET: 'utf-8'
DEFAULT_EXCEPTION_REPORTER_FILTER: 'django.views.debug.SafeExceptionReporterFilter'
DEFAULT_FILE_STORAGE: 'django.core.files.storage.FileSystemStorage'
DEFAULT_FROM_EMAIL: 'PROJ <noreply@proj.com>'
DEFAULT_INDEX_TABLESPACE: ''
DEFAULT_TABLESPACE: ''
DISALLOWED_USER_AGENTS: []
EMAIL_BACKEND: 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST: 'localhost'
EMAIL_HOST_PASSWORD: '********'
EMAIL_HOST_USER: ''
EMAIL_PORT: 25
EMAIL_SSL_CERTFILE: None
EMAIL_SSL_KEYFILE: '********'
EMAIL_SUBJECT_PREFIX: '[Django] '
EMAIL_TIMEOUT: None
EMAIL_USE_LOCALTIME: False
EMAIL_USE_SSL: False
EMAIL_USE_TLS: False
FILE_CHARSET: 'utf-8'
FILE_UPLOAD_DIRECTORY_PERMISSIONS: None
FILE_UPLOAD_HANDLERS: ['django.core.files.uploadhandler.MemoryFileUploadHandler',
'django.core.files.uploadhandler.TemporaryFileUploadHandler']
FILE_UPLOAD_MAX_MEMORY_SIZE: 2621440
FILE_UPLOAD_PERMISSIONS: 420
FILE_UPLOAD_TEMP_DIR: None
FIRST_DAY_OF_WEEK: 0
FIXTURE_DIRS: []
FORCE_SCRIPT_NAME: None
FORMAT_MODULE_PATH: None
FORM_RENDERER: 'django.forms.renderers.TemplatesSetting'
IGNORABLE_404_URLS: []
INSTALLED_APPS: ['proj.apps.SuitConfig',
'fullurl',
'django_telegrambot',
'django_jalali',
'django_extensions',
'debug_toolbar',
'django_user_agents',
'htmlemailer',
'qsessions',
'django.forms',
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.humanize',
# .... my proj apps here
]
INTERNAL_IPS: ['127.0.0.1']
LANGUAGES:
(('fa', 'Farsi'), ('en', 'انگلیسی'))
LANGUAGES_BIDI: ['he', 'ar', 'fa', 'ur']
LANGUAGE_CODE: 'fa'
LANGUAGE_COOKIE_AGE: None
LANGUAGE_COOKIE_DOMAIN: None
LANGUAGE_COOKIE_HTTPONLY: False
LANGUAGE_COOKIE_NAME: 'django_language'
LANGUAGE_COOKIE_PATH: '/'
LANGUAGE_COOKIE_SAMESITE: None
LANGUAGE_COOKIE_SECURE: False
LOCALE_PATHS: []
LOGGING: {
'disable_existing_loggers': False,
'formatters': { 'standard': { 'format': '%(asctime)s [%(levelname)s] '
'%(name)s: %(message)s'}},
'handlers': { 'file': { 'backupCount': 10,
'class': 'logging.handlers.RotatingFileHandler',
'filename': '/var/log/proj/website.log',
'formatter': 'standard',
'level': 'INFO',
'maxBytes': 10485760}},
'loggers': { 'django': { 'handlers': ['file'],
'level': 'INFO',
'propagate': True}},
'version': 1}
LOGGING_CONFIG: 'logging.config.dictConfig'
LOGIN_REDIRECT_URL: 'dashboard'
LOGIN_URL: 'login'
LOGOUT_REDIRECT_URL: 'index'
MANAGERS: []
MAX_STRING_LENGTH: 65536
MEDIA_ROOT: '/home/proj/website/media'
MEDIA_URL: '/media/'
MESSAGE_STORAGE: 'django.contrib.messages.storage.fallback.FallbackStorage'
MESSAGE_TAGS: {
25: 'success', 40: 'danger'}
MIDDLEWARE: ['htmlmin.middleware.MarkRequestMiddleware',
'htmlmin.middleware.HtmlMinifyMiddleware',
'debug_toolbar.middleware.DebugToolbarMiddleware',
'django.middleware.security.SecurityMiddleware',
'qsessions.middleware.SessionMiddleware',
'django.middleware.locale.LocaleMiddleware',
'django.middleware.common.CommonMiddleware',
'django.middleware.csrf.CsrfViewMiddleware',
'django.contrib.auth.middleware.AuthenticationMiddleware',
'django.contrib.messages.middleware.MessageMiddleware',
'django.middleware.clickjacking.XFrameOptionsMiddleware',
'django_user_agents.middleware.UserAgentMiddleware']
MIGRATION_MODULES: {
}
MONTH_DAY_FORMAT: 'F j'
NUMBER_GROUPING: 0
PASSWORD_HASHERS: '********'
PASSWORD_RESET_TIMEOUT_DAYS: '********'
PREPEND_WWW: False
ROOT_URLCONF: 'proj.urls'
SECRET_KEY: '********'
SECURE_BROWSER_XSS_FILTER: False
SECURE_CONTENT_TYPE_NOSNIFF: True
SECURE_HSTS_INCLUDE_SUBDOMAINS: False
SECURE_HSTS_PRELOAD: False
SECURE_HSTS_SECONDS: 0
SECURE_PROXY_SSL_HEADER: None
SECURE_REDIRECT_EXEMPT: []
SECURE_REFERRER_POLICY: None
SECURE_SSL_HOST: None
SECURE_SSL_REDIRECT: False
SENTRY_API_KEY: '********'
SENTRY_TRACES_SAMPLE_RATE: 0.0001
SERVER_EMAIL: 'root@localhost'
SESSION_CACHE_ALIAS: 'default'
SESSION_COOKIE_AGE: 1209600
SESSION_COOKIE_DOMAIN: None
SESSION_COOKIE_HTTPONLY: True
SESSION_COOKIE_NAME: 'sessionid'
SESSION_COOKIE_PATH: '/'
SESSION_COOKIE_SAMESITE: 'Lax'
SESSION_COOKIE_SECURE: False
SESSION_ENGINE: 'qsessions.backends.cached_db'
SESSION_EXPIRE_AT_BROWSER_CLOSE: False
SESSION_FILE_PATH: None
SESSION_SAVE_EVERY_REQUEST: False
SESSION_SERIALIZER: 'django.contrib.sessions.serializers.JSONSerializer'
SETTINGS_MODULE: 'proj.settings'
SHORT_DATETIME_FORMAT: 'm/d/Y P'
SHORT_DATE_FORMAT: 'm/d/Y'
SIGNING_BACKEND: 'django.core.signing.TimestampSigner'
SILENCED_SYSTEM_CHECKS: []
STATICFILES_DIRS: ['/home/proj/website/proj/static']
STATICFILES_FINDERS: ['django.contrib.staticfiles.finders.FileSystemFinder',
'django.contrib.staticfiles.finders.AppDirectoriesFinder']
STATICFILES_STORAGE: 'proj.storages.ForgivingManifestStaticFilesStorage'
STATIC_ROOT: '/home/proj/website/static'
STATIC_URL: '/static/'
TEMPLATES: [{'APP_DIRS': True,
'BACKEND': 'django.template.backends.django.DjangoTemplates',
'DIRS': ['/home/proj/website/templates'],
'OPTIONS': {'context_processors': ['django.template.context_processors.debug',
'django.template.context_processors.request',
'django.contrib.auth.context_processors.auth',
'django.contrib.messages.context_processors.messages']}}]
TEST_NON_SERIALIZED_APPS: []
TEST_RUNNER: 'django.test.runner.DiscoverRunner'
THOUSAND_SEPARATOR: ','
TIME_FORMAT: 'P'
TIME_INPUT_FORMATS: ['%H:%M:%S', '%H:%M:%S.%f', '%H:%M']
TIME_ZONE: 'Asia/Tehran'
USE_I18N: True
USE_L10N: True
USE_THOUSAND_SEPARATOR: False
USE_TZ: True
USE_X_FORWARDED_HOST: False
USE_X_FORWARDED_PORT: False
WSGI_APPLICATION: 'proj.wsgi.application'
X_FRAME_OPTIONS: 'DENY'
YEAR_MONTH_FORMAT: 'F Y'
is_overridden: <bound method Settings.is_overridden of <Settings "proj.settings">>

Steps to Reproduce

Required Dependencies

Minimal Python Version: 3.6

Minimal Celery Version: 4.4

Minimal Kombu Version: 4.6.11

Minimal Broker Version: 4.0.9

Minimal Result Backend Version: 4.0.9

Minimal OS and/or Kernel Version: Ubuntu 18.04

Minimal Broker Client Version: 3.5.3

Minimal Result Backend Client Version: 3.5.3

Python Packages

pip freeze Output:

aiohttp==3.6.2
amqp==2.6.1 (I don't think that I'm using this)
asgiref==3.2.5
async-timeout==3.0.1
attrs==19.3.0
beautifulsoup4==4.8.2
billiard==3.6.3.0
celery==4.4.7
certifi==2019.11.28
cffi==1.14.0
chardet==3.0.4
commonmark==0.9.1
commonmarkextensions==0.0.5
cryptography==2.8
cssutils==1.0.2
decorator==4.4.2
Django==3.0.8
django-debug-toolbar==2.2
django-extensions==2.2.8
django-forgiving-collectstatic==1.0.0
django-fullurl==1.1
django-html-emailer==0.0.8.1
django-htmlmin==0.11.0
django-ipware==3.0.1
django-jalali==4.0.0
django-qsessions==1.0.0
django-suit @ https://github.com/darklow/django-suit/tarball/v2
-e git://github.com/telebotter/django-telegrambot.git@76742ec4cff775bf4e31df481face7662f5f412f#egg=django_telegrambot
django-user-agents==0.4.0
future==0.18.2
geoip2==4.0.2
html5lib==1.0.1
htpasswd==2.3
idna==2.10
idna-ssl==1.1.0
importlib-metadata==1.7.0
jdatetime==3.6.2
kombu==4.6.11
maxminddb==2.0.2
multidict==4.7.6
orderedmultidict==1.0.1
pkg-resources==0.0.0
psycopg2-binary==2.8.5
pycparser==2.20
pynliner==0.8.0
python-memcached==1.59
python-telegram-bot==12.4.2
pytz==2019.3
redis==3.5.3
requests==2.24.0
sentry-sdk==0.17.3
six==1.14.0
soupsieve==2.0
sqlparse==0.3.1
tornado==6.0.4
typing-extensions==3.7.4.2
ua-parser==0.10.0
urllib3==1.25.10
user-agents==2.1
vine==1.3.0
webencodings==0.5.1
yarl==1.5.1
zipp==3.1.0

Other Dependencies

I'm using celery with Django, placed behind an Apache2 server, using the WSGI mod.
The entries for WSGI are:

WSGIDaemonProcess proj python-home=/home/proj/website/.venv user=proj group=proj socket-user=proj processes=3 threads=15
WSGIProcessGroup proj
WSGIScriptAlias / /home/proj/website/proj/wsgi.py

Minimally Reproducible Test Case

Just use celery with Redis and Django behind apache2, in multi-threaded mode.

Expected Behavior

I expect that celery works every time I run a task.

Actual Behavior

Most of the time starting a task works fine, but sometimes I get this error (or something similar with different values inside ProtocolError):

InvalidResponse: Protocol Error: b'1'
File "django/core/handlers/exception.py", line 34, in inner
response = get_response(request)

Full stacktrace here