I get the following error whenever a custom domain for the S3 endpoint is used.
# WORKS AWS_S3_CUSTOM_DOMAIN = 'example.fra1.digitaloceanspaces.com/{}'.format(AWS_STORAGE_BUCKET_NAME) # DOES NOT WORK ⁉️ AWS_S3_CUSTOM_DOMAIN = 'cdn.example.com/{}'.format(AWS_STORAGE_BUCKET_NAME) CommandError: An error occurred during rendering /home/<user>/<app>/templates/public/index.html: 'https://cdn.example.com/storage/static/node_modules/nouislider/distribute/nouislider.min.css' isn't accessible via COMPRESS_URL ('https://example.fra1.digitaloceanspaces.com/storage/static/') and can't be compressed
If I go to either url the file is accessible, hence its likely that the CDN is ok, URLs are correctly defined, CORS are fine too. Also without django-compressor subdomain delivery had been working fine, leading me to believe the issue is not with django-storages
I've been trying for several hours and ultimately had to do a temporary fix by setting the AWS_S3_CUSTOM_DOMAIN to be the same as the AWS_S3_ENDPOINT_URL. However this is not ideal.
Please see the implementation below.
/requirements.txt
Django==3.1.4 ... boto3~=1.16.46 botocore~=1.19.46 s3transfer~=0.3.3 ... django-storages~=1.11.1 django-compressor~=2.4 /config/settings.py
... # ========================================================== # DJANGO-STORAGES # ========================================================== if LOCALHOST_MODE: MEDIA_URL = '/media/' MEDIA_ROOT = os.path.join(BASE_DIR, 'media') STATIC_URL = '/static/' STATICFILES_DIRS = [os.path.join(BASE_DIR, 'static/'), ] else: AWS_ACCESS_KEY_ID = os.getenv("AWS_ACCESS_KEY_ID") AWS_SECRET_ACCESS_KEY = os.getenv("AWS_SECRET_ACCESS_KEY") AWS_STORAGE_BUCKET_NAME = 'storage' AWS_S3_ENDPOINT_URL = 'https://example.fra1.digitaloceanspaces.com' # WORKS ⚠️ AWS_S3_CUSTOM_DOMAIN = 'example.fra1.digitaloceanspaces.com/{}'.format(AWS_STORAGE_BUCKET_NAME) # DOES NOT WORK ⁉️ AWS_S3_CUSTOM_DOMAIN = 'cdn.example.com/{}'.format(AWS_STORAGE_BUCKET_NAME) AWS_S3_OBJECT_PARAMETERS = { 'CacheControl': 'max-age=86400', } AWS_LOCATION = 'static' AWS_DEFAULT_ACL = 'public-read' STATICFILES_DIRS = (os.path.join(BASE_DIR, "static"), ) STATIC_URL = '{}/{}/{}/'.format(AWS_S3_ENDPOINT_URL, AWS_STORAGE_BUCKET_NAME, AWS_LOCATION) STATICFILES_STORAGE = 'storage_backends.CachedS3Boto3Storage' MEDIA_ROOT = os.path.join(BASE_DIR, "media") MEDIA_URL = '{}/{}/{}/'.format(AWS_S3_ENDPOINT_URL, AWS_STORAGE_BUCKET_NAME, 'media') DEFAULT_FILE_STORAGE = 'storage_backends.MediaStorage' # ========================================================== # DJANGO-COMPRESSOR # ========================================================== COMPRESS_ENABLED = True STATIC_DEPS = True COMPRESS_ROOT = os.path.join(BASE_DIR, "static") COMPRESS_FILTERS = { 'css': ['compressor.filters.css_default.CssAbsoluteFilter', 'compressor.filters.cssmin.rCSSMinFilter'], 'js': ['compressor.filters.jsmin.JSMinFilter'] } if LOCALHOST_MODE: COMPRESS_OFFLINE = False else: COMPRESS_OFFLINE = True COMPRESS_STORAGE = STATICFILES_STORAGE COMPRESS_URL = STATIC_URL STATICFILES_FINDERS = [ 'django.contrib.staticfiles.finders.FileSystemFinder', 'django.contrib.staticfiles.finders.AppDirectoriesFinder', 'compressor.finders.CompressorFinder', ] ... /storage_backends.py
from django.core.files.storage import get_storage_class from storages.backends.s3boto3 import S3Boto3Storage from config import settings class MediaStorage(S3Boto3Storage): bucket_name = settings.AWS_STORAGE_BUCKET_NAME location = 'media' class CachedS3Boto3Storage(S3Boto3Storage): def __init__(self, *args, **kwargs): super(CachedS3Boto3Storage, self).__init__(*args, **kwargs) self.local_storage = get_storage_class( "compressor.storage.CompressorFileStorage")() def save(self, name, content): self.local_storage._save(name, content) super(CachedS3Boto3Storage, self).save(name, self.local_storage._open(name)) return name 
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