Module: ActionDispatch::Http::Cache::Request

Included in:

Request

Defined in:

actionpack/lib/action_dispatch/http/cache.rb

Constant Summary

HTTP_IF_MODIFIED_SINCE =

'HTTP_IF_MODIFIED_SINCE'.freeze

HTTP_IF_NONE_MATCH =

'HTTP_IF_NONE_MATCH'.freeze

Instance Method Summary (collapse)

• - (Boolean) etag_matches?(etag)
• - (Boolean) fresh?(response)

  Check response freshness (Last-Modified and ETag) against request If-Modified-Since and If-None-Match conditions.

• - (Object) if_modified_since
• - (Object) if_none_match
• - (Boolean) not_modified?(modified_at)

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# File 'actionpack/lib/action_dispatch/http/cache.rb', line 25

def etag_matches?(etag)
  if_none_match && if_none_match == etag
end

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# File 'actionpack/lib/action_dispatch/http/cache.rb', line 32

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

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# File 'actionpack/lib/action_dispatch/http/cache.rb', line 11

def if_modified_since
  if since = env[HTTP_IF_MODIFIED_SINCE]
    Time.rfc2822(since) rescue nil
  end
end

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# File 'actionpack/lib/action_dispatch/http/cache.rb', line 17

def if_none_match
  env[HTTP_IF_NONE_MATCH]
end

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# File 'actionpack/lib/action_dispatch/http/cache.rb', line 21

def not_modified?(modified_at)
  if_modified_since && modified_at && if_modified_since >= modified_at
end