Methods

Constants

HTTP_IF_MODIFIED_SINCE = "HTTP_IF_MODIFIED_SINCE"
HTTP_IF_NONE_MATCH = "HTTP_IF_NONE_MATCH"

Instance Public methods

etag_matches?(etag)

📝 Source code 
# File actionpack/lib/action_dispatch/http/cache.rb, line 32
        def etag_matches?(etag)
          if etag
            validators = if_none_match_etags
            validators.include?(etag) || validators.include?("*")
          end
        end
🔎 See on GitHub

fresh?(response)

Check response freshness (Last-Modified and ETag) against request If-Modified-Since and If-None-Match conditions. If both headers are supplied, based on configuration, either ETag is preferred over Last-Modified or both are considered equally. You can adjust the preference with config.action_dispatch.strict_freshness. Reference: tools.ietf.org/html/rfc7232#section-6

📝 Source code 
# File actionpack/lib/action_dispatch/http/cache.rb, line 45
        def fresh?(response)
          if Request.strict_freshness
            if if_none_match
              etag_matches?(response.etag)
            elsif if_modified_since
              not_modified?(response.last_modified)
            else
              false
            end
          else
            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
        end
🔎 See on GitHub

if_modified_since()

📝 Source code 
# File actionpack/lib/action_dispatch/http/cache.rb, line 14
        def if_modified_since
          if since = get_header(HTTP_IF_MODIFIED_SINCE)
            Time.rfc2822(since) rescue nil
          end
        end
🔎 See on GitHub

if_none_match()

📝 Source code 
# File actionpack/lib/action_dispatch/http/cache.rb, line 20
        def if_none_match
          get_header HTTP_IF_NONE_MATCH
        end
🔎 See on GitHub

if_none_match_etags()

📝 Source code 
# File actionpack/lib/action_dispatch/http/cache.rb, line 24
        def if_none_match_etags
          if_none_match ? if_none_match.split(",").each(&:strip!) : []
        end
🔎 See on GitHub

not_modified?(modified_at)

📝 Source code 
# File actionpack/lib/action_dispatch/http/cache.rb, line 28
        def not_modified?(modified_at)
          if_modified_since && modified_at && if_modified_since >= modified_at
        end
🔎 See on GitHub