def set_caching_headers(self, content, response):
"""
Sets caching headers based on whether or not the asset is locked.
"""
is_locked = getattr(content, "locked", False)
# We want to signal to the end user's browser, and to any intermediate proxies/caches,
# whether or not this asset is cacheable. If we have a TTL configured, we inform the
# caller, for unlocked assets, how long they are allowed to cache it. Since locked
# assets should be restricted to enrolled students, we simply send headers that
# indicate there should be no caching whatsoever.
cache_ttl = CourseAssetCacheTtlConfig.get_cache_ttl()
if cache_ttl > 0 and not is_locked:
newrelic.agent.add_custom_parameter('contentserver.cacheable',
True)
response['Expires'] = StaticContentServer.get_expiration_value(
datetime.datetime.utcnow(), cache_ttl)
response[
'Cache-Control'] = "public, max-age={ttl}, s-maxage={ttl}".format(
ttl=cache_ttl)
elif is_locked:
newrelic.agent.add_custom_parameter('contentserver.cacheable',
False)
response['Cache-Control'] = "private, no-cache, no-store"
response['Last-Modified'] = content.last_modified_at.strftime(
HTTP_DATE_FORMAT)
# Force the Vary header to only vary responses on Origin, so that XHR and browser requests get cached
# separately and don't screw over one another. i.e. a browser request that doesn't send Origin, and
# caches a version of the response without CORS headers, in turn breaking XHR requests.
force_header_for_response(response, 'Vary', 'Origin')
def set_caching_headers(self, content, response):
"""
Sets caching headers based on whether or not the asset is locked.
"""
is_locked = getattr(content, "locked", False)
# We want to signal to the end user's browser, and to any intermediate proxies/caches,
# whether or not this asset is cacheable. If we have a TTL configured, we inform the
# caller, for unlocked assets, how long they are allowed to cache it. Since locked
# assets should be restricted to enrolled students, we simply send headers that
# indicate there should be no caching whatsoever.
cache_ttl = CourseAssetCacheTtlConfig.get_cache_ttl()
if cache_ttl > 0 and not is_locked:
newrelic.agent.add_custom_parameter('contentserver.cacheable', True)
response['Expires'] = StaticContentServer.get_expiration_value(datetime.datetime.utcnow(), cache_ttl)
response['Cache-Control'] = "public, max-age={ttl}, s-maxage={ttl}".format(ttl=cache_ttl)
elif is_locked:
newrelic.agent.add_custom_parameter('contentserver.cacheable', False)
response['Cache-Control'] = "private, no-cache, no-store"
response['Last-Modified'] = content.last_modified_at.strftime(HTTP_DATE_FORMAT)
# Force the Vary header to only vary responses on Origin, so that XHR and browser requests get cached
# separately and don't screw over one another. i.e. a browser request that doesn't send Origin, and
# caches a version of the response without CORS headers, in turn breaking XHR requests.
force_header_for_response(response, 'Vary', 'Origin')
def set_caching_headers(self, content, response):
"""
Sets caching headers based on whether or not the asset is locked.
"""
is_locked = getattr(content, "locked", False)
# We want to signal to the end user's browser, and to any intermediate proxies/caches,
# whether or not this asset is cacheable. If we have a TTL configured, we inform the
# caller, for unlocked assets, how long they are allowed to cache it. Since locked
# assets should be restricted to enrolled students, we simply send headers that
# indicate there should be no caching whatsoever.
cache_ttl = CourseAssetCacheTtlConfig.get_cache_ttl()
if cache_ttl > 0 and not is_locked:
response['Expires'] = StaticContentServer.get_expiration_value(
datetime.datetime.utcnow(), cache_ttl)
response[
'Cache-Control'] = "public, max-age={ttl}, s-maxage={ttl}".format(
ttl=cache_ttl)
elif is_locked:
response['Cache-Control'] = "private, no-cache, no-store"
response['Last-Modified'] = content.last_modified_at.strftime(
HTTP_DATE_FORMAT)
remove_headers_from_response(response, "Vary")
def set_caching_headers(self, content, response):
"""
Sets caching headers based on whether or not the asset is locked.
"""
is_locked = getattr(content, "locked", False)
# We want to signal to the end user's browser, and to any intermediate proxies/caches,
# whether or not this asset is cacheable. If we have a TTL configured, we inform the
# caller, for unlocked assets, how long they are allowed to cache it. Since locked
# assets should be restricted to enrolled students, we simply send headers that
# indicate there should be no caching whatsoever.
cache_ttl = CourseAssetCacheTtlConfig.get_cache_ttl()
if cache_ttl > 0 and not is_locked:
response['Expires'] = StaticContentServer.get_expiration_value(datetime.datetime.utcnow(), cache_ttl)
response['Cache-Control'] = "public, max-age={ttl}, s-maxage={ttl}".format(ttl=cache_ttl)
elif is_locked:
response['Cache-Control'] = "private, no-cache, no-store"
response['Last-Modified'] = content.last_modified_at.strftime(HTTP_DATE_FORMAT)
remove_headers_from_response(response, "Vary")
