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Methods
E
F
I
N
Constants
HTTP_IF_MODIFIED_SINCE = "HTTP_IF_MODIFIED_SINCE".freeze
 
HTTP_IF_NONE_MATCH = "HTTP_IF_NONE_MATCH".freeze
 
Instance Public methods
etag_matches?(etag)
# File actionpack/lib/action_dispatch/http/cache.rb, line 26
def etag_matches?(etag)
  if etag
    validators = if_none_match_etags
    validators.include?(etag) || validators.include?("*")
  end
end
fresh?(response)

Check response freshness (Last-Modified and ETag) against request If-Modified-Since and If-None-Match conditions. If both headers are supplied, both must match, or the request is not considered fresh.

# File actionpack/lib/action_dispatch/http/cache.rb, line 36
def fresh?(response)
  last_modified = if_modified_since
  etag          = if_none_match

  return false unless last_modified || etag

  success = true
  success &&= not_modified?(response.last_modified) if last_modified
  success &&= etag_matches?(response.etag) if etag
  success
end
if_modified_since()
# File actionpack/lib/action_dispatch/http/cache.rb, line 8
def if_modified_since
  if since = get_header(HTTP_IF_MODIFIED_SINCE)
    Time.rfc2822(since) rescue nil
  end
end
if_none_match()
# File actionpack/lib/action_dispatch/http/cache.rb, line 14
def if_none_match
  get_header HTTP_IF_NONE_MATCH
end
if_none_match_etags()
# File actionpack/lib/action_dispatch/http/cache.rb, line 18
def if_none_match_etags
  if_none_match ? if_none_match.split(/\s*,\s*/) : []
end
not_modified?(modified_at)
# File actionpack/lib/action_dispatch/http/cache.rb, line 22
def not_modified?(modified_at)
  if_modified_since && modified_at && if_modified_since >= modified_at
end